Applying virtual reality and augmented reality to the tourism experience: a comparative literature review

Purpose – The purpose of this paper is to investigate how previous literature has analyzed the role of augmented reality and virtual reality in the ﬁ eld of tourism, distinguishing between studies focused on one technologyor the otherasboth have characteristicsthat profoundly differentiatethem. Design/methodology/approach – This study carries out a critical review to assess and synthesize the literature on augmented reality and virtualreality in tourism. Literature searches are conducted using various keywords, resulting in a selection of 84 articles (19 on augmented reality and 65 on virtual reality) from 39 indexed journals. Findings – The research ﬁ ndings demonstrate an increasing scholarly focus on exploring the application of virtual reality and augmented reality within the realm of tourism. These results highlight a noticeable progression in recent years with respect to different matters, such as methodologies, used theories or considered variables, among others. Based on these results, it is proposed a future research agenda that seeks to establish a cohesiveframeworkanddrivethedevelopmentofbothaugmentedrealityandvirtualrealityresearchintourism. Originality/value – By conducting an individual and comparative review of the literature on the application of augmented reality and virtual reality in tourism, this research helps elucidate the speci ﬁ c lines of research for each technology while providing a better understanding of howeach technology can be used to generate effectivetourist experiences.


Introduction
The rapid development and widespread use of information and communication technologies (ICTs) have had a profound impact on society.The advancements in communication facilitated by these technologies have created a global era where unlimited information can be transmitted quickly from any location (Buhalis et al., 2019).This technological evolution has also led to the emergence of reality-virtuality technologies, such as augmented reality (AR), virtual reality (VR) and pure mixed reality (PMR), which are transforming the way customers experience both the real and virtual environments (Tom Dieck and Hang, 2022).AR involves overlaying digital information in the real environment.In VR, users are fully immersed in computergenerated environments, providing a completely virtual experience.PMR combines real and digital elements, enabling their coexistence and interaction with the user (Flavi an et al., 2019).Recent reports note that the immersive technologies market size is expected SJME to reach US$100bn by 2026 (Statista, 2023), which highlights the importance of these technologies for the future development of society.
Tourism, characterized by its intangibility and heterogeneity, benefits greatly from the use of ICTs in enhancing customer experiences (Buhalis et al., 2019).Particularly, the new wave of immersive technologies, such as AR and VR, can help overcome the challenges posed by the intangible nature of tourism products by allowing potential tourists to explore and experience them in novel ways (Guttentag, 2010;Tussyadiah et al., 2018aTussyadiah et al., , 2018b)).Being entertained while learning, access to personalized information or to physical areas/historical moments that are not available, among others, are some of the potential benefits of these technologies for tourism (Guttentag, 2010;tom Dieck and Jung, 2018;Flavi an et al., 2019b).Moreover, these technologies enable the creation of extra-sensory experiences by seamlessly integrating the real and virtual environments (Petit et al., 2019).The potential of immersive technologies in the tourism industry is undeniable, and further research is needed to effectively implement AR and VR to generate valuable tourism experiences.
However, the existing literature on this topic is still in its early stages, and researchers and practitioners emphasize the importance of studying tourists' experiences with AR and VR technologies (Loureiro et al., 2020;Wei, 2019;Yung and Khoo-Lattimore, 2017).Particularly, given the novelty of this research area and the ongoing advancements, most of the research has been published in recent years, being this literature fragmented without having a common focus.There have been literature reviews attempting to harmonize the existing work to offer common lines of research to be analyzed by the research community (e.g.Fan et al. (2022b); Loureiro et al., 2020;Wei, 2019).All these literature reviews have considered AR and VR together, at the same level.However, as both AR and VR have different features that clearly distinguish them (Flavi an et al., 2019), the individual and comparative review of the literature on the application of AR or VR in tourism can help to elucidate the specific lines of research for each technology while providing a better understanding of how each technology can be used to generate effective tourist experiences.
Based on this gap, this article follows a critical review process (Snyder, 2019) to analyze individually the literature on AR and VR in the field of tourism, proceeding to make a comparison between both streams of research.Several parameters are considered: evolution in the number of published papers, tourism contexts addressed, research methods employed, stage of the customer journey, used theories and variables included in the models of the papers.Based on this individual and comparative review of AR and VR in tourism, it is proposed a future research agenda that aims to unify and achieve common progress in this nascent research area.

Overviews of literature reviews about augmented reality an virtual reality in tourism
Immersive technologies, both AR and VR, have revolutionized the tourism industry, offering unprecedented opportunities for immersive experiences and transforming the way travelers engage with tourism attractions (Buhalis et al., 2019).However, as noted before, despite the growing academic interest and adoption of AR and VR in tourism, the literature is fragmented, and there is a noticeable lack of comprehensive literature reviews that consolidate the existing body of research.With the aim of providing an overview of the existing literature reviews on AR and VR in the tourism field, this section presents the current exceptions based on their Tourism experience temporal evolution, analyzing their contributions to the understanding and application of AR and VR in the tourism industry.Beck et al. (2019), considering solely the impact of VR in tourism, conducts a state-of-theart review analysis to contribute to understand VR research in tourism.These authors consider that previous research has not specified the VR system, generating confusion and misunderstanding as the term VR includes systems with different technical capabilities.Based on their levels of immersion, they distinguish between non-(e.g.desktop-based VR), semi-(e.g.multiple projection screens that project content on walls and floor) and fully immersive (complete isolation of the user with the world; e.g.head-mounted displays) VR systems in tourism.The authors explain the different papers on VR research in tourism considering the former taxonomy in an attempt to correctly delineate the terms and associated research.The development of VR devices goes hand in hand with research development: while research before 2013 was mainly based on non-immersive VR, most recent research is focused on full immersive VR.
Yung and Khoo-Lattimore (2017) indicate that there was not known systematic knowledge that emerges from the academic papers on VR and AR in tourism.To that aim, they conducted a systematic quantitative review with 46 papers whose results display that the most selected types of VR/AR are "virtual worlds" and "virtual environments."Among the tourism context in which VR/AR research has emerged, it can be highlighted marketing, education and conceptual.Categories as food and beverage or MICE remains unexplored.As for the methodologies, conceptual papers and quantitative surveys are clearly the most commonly used.The authors claim for the need of more theory-based research on VR/AR in tourism.Among the exceptions, technology acceptance model (TAM), theory of planned behavior and flow theory are the most applied ones.Based on their review, they propose a model of challenges to VR adoption for tourism.
Wei (2019) considers both AR and VR research in hospitality and tourism.She conducted a literature review of 60 papers published between 2000 and.The findings show that there is a growing trend in the publication of papers in this topic.Most of VR/AR research has been conducted in Europe or Asia, covering contexts such as tourism destinations or cultural heritage sites as museums (lack of research in hotels and restaurants).Based on the reviewed literature, the author proposes a unifying framework of VR/AR user experiences consisting of stimuli (service environment, individual differences, interpersonal factors and presence), dimensions of the VR/AR experience (instrumental, experiential, psychological and social) and consequences (e.g.emotional response, satisfaction, destination image, behavioral intentions).The most used theories are grouped into antecedents-related to VR/ AR user experience (e.g.TAM) or process-related theoretical models (e.g.process theory).As for quantitative methodologies, surveys are the most used; while for qualitative methodologies, focus groups and interviews are the most common.Experimental research is beginning to be carried out.Two suggestions for future research are proposed: the need for cross-cultural approach in the studies and more research in events and hospitality settings.
Jingen Liang and Elliot (2020) focus solely on AR application to tourism.They conducted a literature search, which resulted in 32 selected articles.They showed the evolution of AR tourism research, starting with AR design and development toward more novel topics such as gamification, user experience, satisfaction and behavioral intentions.A conceptual map including the constructs of the reviewed articles is presented.Both qualitative (e.g.focus groups) and quantitative (e.g.field survey) methodologies were used.Based on these results, they propose several future research directions (e.g.gamification, actual behaviors, negative consequences of AR, mixed methods).SJME Loureiro et al. (2020), by using citation network analysis and text-mining techniques, conduct a literature review of 56 articles about VR and AR in tourism.The longitudinal analysis highlights the recent wave (from 2014) of published papers in the selected topic, being this trend more pronounced in recent years.They also show the topics covered by the selected literature: smart cities and cultural heritage, mobile uses for sustainable tourism, tourism destination marketing, experiential and telepresence, AR, among others.Based on the results, Loureiro et al. (2020) propose several research questions and four key realms for the future evolution of research on AR and VR in tourism: multisensory experiences, braincomputer interactions, well-being development and use of artificial intelligence in immersive settings.
The most recent literature review is authored by Fan et al. (2022b), who conducted the first meta-analysis on AR and VR research in tourism based on 56 papers (65 studies).The authors identify presence as a key construct which affects both value perceptions (e.g.ease of use, enjoyment) and psychological responses (e.g.flow, affective engagement), resulting in consequences (e.g.behavioral intentions/actual behaviors, attachment).Moderating variables (e.g.experience type) are also included in this proposal.The results of the metaanalysis show that most of the hypotheses are supported.Particularly, presence has direct (and indirect) effects on the mediating variables, which affect the responses.Simulation type and social interaction positively moderate (while prior visitation negatively moderate) the relationship of presence and tourism experience.They also propose opportunities for future research: the application of VR/AR to the different stages of the tourism journey (pre-tour, during, post-tour), possible negative effects of immersive technologies, the use of other methods (e.g.sentiment analysis), immersive technologies and sustainability or social interaction.
Considering the scarcity of previous proposals, this research aims to contribute to generating a common framework in which the community of this nascent research area can advance in a uniform manner.Specifically, previous literature reviews have either focused on one of the two technologies (VR: Beck et al., 2019;AR: Jingen Liang and Elliot, 2020), or considered both of them (Fan et al., 2022a(Fan et al., , 2022b)).However, as previously discussed, the innate characteristics of VR (user immersed in a computer-generated virtual environment; Guttentag, 2010) and AR (virtual information superimposed on the real world; Azuma, 1997) profoundly differentiate these two technologies.Therefore, there is a need for a comparative analysis of how previous literature on AR or VR has been developed in the field of tourism.With this, the aim is to obtain a complete overview of both research fields, displaying their similarities and differences and looking for an integration that will lead to a common roadmap for research on immersive technologies in tourism.

Review methodology
Following Snyder (2019), a critical review process was conducted with the aim of assessing, critiquing and synthesizing the literature on AR/VR in tourism in a way that allows for a new theoretical framework.This method highlights problems or disparities in the existing knowledge about a specific area to constructively inform and provide an appropriate focus and ideas for future studies.First, we conducted literature searches with several keywords ("virtual reality," "augmented reality," "immersive technologies," "tourism," "tourism destination," "hospitality") in databases (Scopus and Web of Science).Once the items have been selected, we excluded books, book chapters, reports and conferences.A final set of 84 papers were selected for the final analysis as of March 7, 2023 [AR (19 articles), VR (65 articles)].Thus, we did not restrict the research to periodicals with the greatest impact on their fields but rather included all the articles from journals indexed by the Web of Science Tourism experience and Scopus containing the keywords.In the second stage, we carried out the analysis to verify whether the studies already identified were appropriate for the purposes of this research.In this phase, we retained only those articles from English language publications.The third phase of this study involved an individualized and independent analysis of the articles through recourse to a predefined evaluation grid that incorporated the analysis of AR/VR to the tourism experience.This grid was subsequently compared and refined.In the fourth and final phase of our study, we completed content analysis and systematized the 84 articles, and extracted summarized information to the subject in terms of the type of study, analysis, conclusions and similarities among studies to create a critical review and joint conceptual framework that synthesizes variables from both technologies.

Number of papers and journals
Early studies analyzing the impact of AR and VR on tourism began in the 1990s (Cheong, 1995;Williams and Hobson, 1995) (see Figure 1).Theoretical developments discussed the idea of VR as a potential substitute or competitor of real tourism (Hobson and Williams, 1995), while others deem that VR will never replace the feeling of an actual trip (Dewailly, 1999).Despite these theoretical advances, literature on this research topic is scarce in the first decade of the 21st century (Loureiro et al., 2020).Nevertheless, the theoretical work of Guttentag ( 2010) is the cornerstone for most of the subsequent research conducted in the field.Guttentag (2010) explores the sensory developments and the applications of VR in the tourism industry.He also discusses the idea of VR as a potential substitute of physical tourism, noting that VR can increase the potential tourists' desire of visiting the real tourist attractions.
According to several systematic literature reviews recently conducted, the largest body of research has been published in the past decade, being this trend more pronounced in the past five years (Loureiro et al., 2020;Wei, 2019).Our review shows a similar pattern, with most of the research being published since 2015.When comparing between AR and VR (see Figure 2), the research in 2010-2015 has mainly focused on AR (19 articles; e.g.Chung et al., 2015;Jung et al., 2015).For instance, Jung et al. (2015) conducted a field study in which visitors of a tourist attraction used an AR app.Their findings show that some properties of the AR app (content and service quality, personalized service) lead to higher satisfaction and intention to recommend the AR experience.However, recent studies are also focusing on VR (Wei et al., 2023;Aldossary and McLean, 2022), being the most addressed research topic in recent years (55 articles selected).In this way, Wei et al. (2023) show that gamification can alleviate fatigue and improve satisfaction levels in a VR tourism experience.The results show that VR articles have mainly focused on destinations (22) and general tourism (19).Some studies analyze the tourist experience by measuring the effect of presence (Tussyadiah et al., 2018a(Tussyadiah et al., , 2018b)), VR pre-experience (Griffin et al., 2017, Orús et al., 2021) or even visitor interactions during a VR experience (Hudson et al., 2019;Lee et al., 2020).In addition, there are studies that focus on certain tourism, such as Wen and Leung (2021) who explore the experiences of young consumers in the purchase of wine and their subsequent  2022), which examines pro-environmental behaviors in terms of tourism.There are also recent articles that consider the context of hotels to explore the role of mental imagery (Bogicevic et al., 2019), telepresence (Israel et al., 2019a(Israel et al., , 2019b) ) or the use of VR to mitigate daily negative mode spillover among hotel frontline employees (Leung et al., 2023).

Stage
This section analyzes the stage of the customer journey in which the research is developed (pre-experience, on-site experience or post-experience; Lemon and Verhoef, 2016).Figure 4 shows the evolution of the selected articles over time according to the stage and the used technology (AR, VR, AR and VR).
For AR, two articles focus on the pre-experience stage.Park and Stangl (2020) identified experience-seeking and boredom-susceptibility as essential elements to classifying travel groups regarding AR apps.Cranmer et al. (2021) develop a business model considering AR in a theme park context.In the on-site stage, the number of AR articles exceeds VR articles.Studies at this stage begin in 2015 (e.g.discovering the functional properties of the AR system evoke feelings of pleasure and arousal, Kourouthanassis et al., 2015), and 2018 is the most prolific one.For example, tom Dieck et al. (2018) find that the use of AR HMD helps visitors to see the connections between the pieces of art and personalize their experiences, and Tussyadiah et al. (2018b) find that the perceived enjoyment with AR enhances the overall museum experience.The remaining six articles on AR (Kounavis et al., 2012;Han et al., 2013) do not consider any stage.
As for VR, most articles have considered the pre-experience stage (40 papers since 2017; see Figure 4).Griffin et al. (2017) show that VR is more effective than other media (2D video and website) to create more powerful affective destination images and behavioral intentions.Recent years have witnessed more VR research in tourism pre-stage.For example, Bogicevic et al. (2019) explore the role of mental imagery and presence in VR hotel pre-experiences, Zeng et al. (2020) analyze the effect of adding VR to online reviews in a hotel setting, Lee et al. (2021) explore the effects of VR features (vividness and interactivity) on media richness and Talwar et al. (2022) underline the relationship between motivational forces and proenvironmental behaviors.In the on-site stage, the effect of presence in VR tourism is highlighted to generate enjoyable experiences and improve the attitude toward a destination (Tussyadiah et al., 2018a).Additionally, Leung et al. (2023) note that the hotel frontline employees with high (vs low) levels of trait mindfulness are less likely to be influenced by their negative moods before work when exposed to the VR intervention (Leung et al., 2023).To sum up, the application of immersive technologies was first analyzed during the tourism experience, but the most recent research is being contextualized in the pre-experience stage; the analysis of AR and VR in tourism post-experiences is still at an early stage (Wedel et al., 2020), being addressed only at the theoretical level (Neuburger et al., 2019).

Research method
Over the years, research on AR and VR tourism has been studied through qualitative and quantitative methodologies (see Figure 5).In general, there have been less qualitative than Tourism experience quantitative studies.However, it is since 2013 when more quantitative (compared to qualitative) studies have been published, been this trend more pronounced since 2017 (even doubling the qualitative ones in 2018).
Specifically, research has moved from exploratory studies using mainly qualitative techniques (e.g.in-depth interviews; Han et al., 2013), to recent studies with a more confirmatory focus, which frequently use quantitative techniques (e.g.lab experiments; Israel et al., 2019aIsrael et al., , 2019b)).As an example of qualitative research, Han et al. (2013) conducted in-depth interviews with visitors of a destination who were asked about which features AR apps should have for enhancing their tourism experiences.The results of the thematic analysis performed show that careful design, multi-language functionality, ease of use and personalization in AR apps are highly valued by visitors.Conversely, Willems et al. (2019) carried out a lab experiment (quantitative) in which participants could view a destination using static images, 360-degree video using a computer or a VR HMD.The results show that VR, compared to the other formats, generates higher perceptions of vividness, interactivity and presence.Both vividness and interactivity affect sense of presence, which subsequently influences flow, enjoyment and online purchase intentions.
Figure 6 shows the different methodologies used in the 84 articles selected for this study, according to the technology analyzed.
On the one hand, four of them carry out a conceptual methodology to explore how AR creates value for different contexts (tourism, Kounavis et al., 2012;heritage, Bec et al., 2019;  et al., 2019;theme park, Cranmer et al., 2021).It is worth noting the case study of Cranmer et al. (2021) who develop an AR business model for a small UNESCO visitor attraction.As noted before, Han et al. (2013) explore the elements to create an effective AR travel app through in-depth interviews, while tom Dieck and Jung (2018) analyze the factors that affect users' acceptance of AR by conducting focus groups.Semistructured interviews are also applied in this context (Cranmer et al., 2020;Han et al., 2019).
Regarding studies with quantitative methodology, questionnaire has mostly used in field studies (e.g. to explore the antecedents of AR satisfaction, Chung et al., 2018).In addition, there are studies that contemplate online questionnaires (e.g. to study sensation-seeking in travelers' experiences with AR; Park and Stangl, 2020) and experiments (e.g. to identify factors that foster AR adoption in museums; He et al., 2018).
On the other hand, there is a minority of VR articles with qualitative techniques.Among the exceptions, Martins et al. (2017) propose a multisensory VR tourism model and Bec et al. (2019) explore the efficacy of creating tourism experiences in destinations.
However, most studies in this category employ a quantitative methodology.From 2018, experimentation is the most used method (e.g.lab experiment by Griffin et al., 2017; lab and field experiments by Tussyadiah et al., 2018a).Subsequently, the use of this methodology has increased considerably (e.g. to analyze how the addition of ambient aromas to a VR experience affects digital pre-experiences with a destination, Flavi an et al., 2021a, 2021b; to explore the influence of virtual wine tours on the sensory wine experience behaviors of young consumers; Wen and Leung, 2021; to examine how media technologies and users' gender influence the ways in which tourists gather pre-purchase information; Martínez-Mol es et al., 2022; to compare two types of VR images in hotel promotions using selfreported and psycho-physiological measures, Slevitch et al., 2022).
Online questionnaires have also been used in VR research in tourism.Disztinger et al. (2017) find that perceived usefulness, enjoyment, immersion and interest influence behavioral intentions to use VR for travel planning.Another example is the study of Lee et al. (2020) whose results show that content quality, system quality and vividness of telepresence, which affect behavioral intentions to visit the destination displayed in VR.

Theories
Different theories have been used to study AR and VR in tourism experiences.Table 1 presents the relevant empirical research on AR (six articles) and VR (26 articles) in the context of tourism divided into the main theoretical foundations: models, media, presence, consumer behavior and other theories.
Regarding AR, only six articles are theory-based driven.The TAM is the most used.For instance, Chung et al. (2015) note that perceived usefulness and ease of use of AR affect the intention to use AR and visit a destination.Other theories that have been employed in AR research are the mental imagery theory (He et al., 2018), the technology mediation theory (Tussyadiah et al., 2018a, the classic 4E theory (Hu et al., 2021), the unified theory of acceptance and use of technology (UTAUT, Ronaghi and Ronaghi, 2022).
VR tourism studies incorporate presence-related theories, which refers to the psychological sense of "being there" in a mediated virtual environment while physically being situated in another, including through the presence theory (Wei et al., 2019).Related to presence, two VR articles use the presence-emotion-intention framework (PEI), which is a top-to-bottom approach, from the determinants of presence, to how presence impacts emotion and consequently, intentions (Yung et al., 2021a(Yung et al., , 2021c)).However, the most used theories in VR tourism research are the TAM and the stimuli-organism-response (SOR) model (Kim et al., 2021).This last model explains that stimuli are processed by an internal Tourism experience component, the organism, and this finally leads to the performance (or not) of certain behaviors (Flavi an et al., 2019).The remaining articles on VR consider another series of theories and models (e.g.Media Richness Theory; Lee et al., 2021;expectancy theory, Talwar et al., 2022).
As shown in Table 1, a multitude of theories has been applied to both AR and VR tourism research.However, it should be highlighted the TAM is the most used model for this area of research on both technologies (a total of six articles).

Variables
This section identifies the key concepts applied in the research on AR and VR in tourism.Figure 7 displays the most important antecedents (considering three dimensions: device, content and user) and consequences that have been studied in the previous literature.This gives rise to a new conceptual AR/VR tourism research framework (see Figure 7) that combines both dimensions in a graphic and visual way.

Tourism experience
Regarding AR variables, we highlight device variables, where we find effort expectancy, one of the most used (Ronaghi and Ronaghi, 2022;Calderón-Fajardo et al., 2023).Regarding content, personalized service with the AR app has only been studied in the context of AR (Jung et al., 2015).It refers to the ability to provide personalized information, understand the users' needs and preferences, as well as personalized interaction (Jung et al., 2015).In addition, in the context of AR in tourism, it has also been addressed variables related to users' personal perceptions: critical mass (Hsiao and Tang, 2021), ease of imagination (Orús et al., 2021), innovation resistance and social influence (Ronaghi and Ronaghi, 2022) or social interaction (Hudson et al., 2019;Kim et al., 2020aKim et al., , 2020b)).Finally, this study identifies the consequences derived from the use of AR in tourism: such as continuing use intention (Chung et al., 2018), emotional arousal and feeling of belonging (Hu et al., 2021), as well as the willingness to pay more to use this technology in their tourism experiences (He et al., 2018).

Conclusions
Recent technologies such as AR and VR are gaining attention in the field of marketing research, especially for services such as tourism.Through AR and VR, it is possible to create different tourism experiences with the aim of providing added value to tourists.This research highlights the recent gap in the literature.Previous literature reviews have considered AR and VR together, at the same level.Nevertheless, AR and VR are two distinct technologies with unique features that set them apart.To gain a comprehensive understanding of their individual potentials and shed light on specific research avenues for each, a literature review examining the application of AR and VR in tourism becomes imperative.Such a review not only delves into the extensive body of literature on each technology but also facilitates comparative analysis, enabling us to discern the respective lines of research of AR and VR in generating impactful and immersive tourist experiences.

SJME
Based on that, an AR/VR tourism research framework (Figure 7) is displayed, and a research agenda will be proposed.
Our literature review highlights the increasing importance of AR and VR technologies in tourism research, stressing their potential to change the tourists' experiences.A significant portion of the reviewed studies have been published since 2018, which brings the novelty of this research area and the growing interest.The 84 reviewed articles are classified into six contexts: destination, memory tourism, hotel, museum, theme park and tourism (general).The most commonly studied context for both AR and VR is general tourism, followed by destination, and hotels.Specifically, for AR, museums have received the most attention (Jung et al., 2016;tom Dieck et al., 2018), while for VR destination-related topics have more relevance.
As for the stage of the customer's journey in which the studies are developed, in AR, there are two articles focusing on the pre-experience stage.These studies explore elements such as travel group classification based on experience-seeking and boredom-susceptibility, and the development of a business model considering AR in a theme park (Cranmer et al., 2021;Park and Stangl, 2020).By contrast, most of the AR articles are developed in the onsite stage, starting from 2015, with studies examining the functional properties of AR systems (Kourouthanassis et al., 2015), the use of AR head-mounted displays in art experiences (tom Dieck et al., 2018), or the influence of perceived enjoyment on overall experiences (Han et al., 2013).For VR, most of the articles consider the pre-experience stage, with a total of 40 papers since 2017.These studies investigate topics such as the effectiveness of different media in digital pre-experiences (Griffin et al., 2017), the role of mental imagery and presence in VR hotel pre-experiences (Bogicevic et al., 2019), the effect of adding VR to online reviews (Zeng et al., 2020) and the impact of VR features on media richness (Lee et al., 2021).There is also an increasing number of studies in recent years exploring the relationship between motivational forces and pro-environmental behaviors in VR pre-experiences (Talwar et al., 2022).In terms of onsite experiences, studies have examined the effect of presence in VR tourism experiences (Wei et al., 2019), the influence of social factors on word-of-mouth and willingness to pay (He et al., 2018) and the impact of trait mindfulness on employee experiences with VR interventions (Leung et al., 2023).
Regarding the used methodology, the research on immersive technologies (AR and VR) in tourism has evolved over the past two decades, with a shift from qualitative exploratory studies to more confirmatory studies employing quantitative techniques.Qualitative methods, such as in-depth interviews, have been used to understand visitors' preferences that enhance their tourism experiences (Han et al., 2013) or focus groups (Jung et al., 2018a).More recently, one of the most used methodologies is lab experiments, which have been used to compare different formats (e.g.static images, 360-degree videos, VR) and assess the impact of immersive technologies on perceptions of vividness, interactivity, presence, flow, enjoyment and purchase intentions (Israel et al., 2019a(Israel et al., , 2019b;;Willems et al., 2019).Specifically, studies on AR have mainly focused on qualitative methods (e.g.in-depth interviews; Han et al., 2013) and conceptual papers (Cranmer et al., 2021) to provide comprehensive overviews for understanding the application of this technology in tourism.On the other hand, VR studies have used different methodologies, with a majority using quantitative methods such as lab experiments (Flavi an et al., 2021a(Flavi an et al., , 2021b;;Wen and Leung, 2021) and online questionnaires (Lee et al., 2020).
Both AR and VR tourism research articles draw upon a wide variety of theories, but the TAM stands out as the most used model in research on both technologies.TAM is applied in six articles (AR: Chung et al. [2015], tom Dieck and Jung [2018], VR: Disztinger et al. [2017], Israel et al. [2019a], Schiopu et al. [2021], Fan et al. [2022a]), what highlights its significance Tourism experience et al., 2018]).Literature also highlights variables that are common to both technologies: three device-related variables (perceived usefulness [e.g.Kourouthanassis et al., 2015], technology readiness [e.g.Kim et al., 2020a, 2020b], perceived quality [e.g. tom Dieck and Jung, 2018]), four for content, highlighting visual appeal, Marasco et al., 2018;Orús et al., 2021;and, three for user's experience (enjoyment [e.g. Fan et al., 2022a]; escapism [e.g.Serravalle et al., 2019]; usefulness [e.g.Li and Chen, 2019]).Common consequences include four interesting variables (attitude toward the technology, Errichiello et al., 2019;intention to visit, Yung et al., 2021a;nostalgia, Hu et al., 2021;usage intention, Chung et al., 2015).Due to the nature of this literature review, this study is not without its limitations.It was not possible to perform a meta-analysis due to the large degree of heterogeneity in the studies included in this review.Apart from the study of Fan et al. (2022b), more meta-analyses studies are needed to advance on this topic.Additionally, it is important to identify the possibility of publication selection biases, as the search was limited to English papers available on two databases (Scopus and Web of Science) until a certain date, which may limit the number of potential papers identified and included in this review.Future studies should be conducted to find a consensus in the current literature wave on AR and VR in tourism.Finally, this research has focused solely on AR and VR.However, considering the recent push of the so-called PMR (Flavi an et al., 2019), and the upcoming release of PMR devices by big-tech companies such as Apple (Apple Vision Pro), it seems feasible that the future development of immersive technologies will be based on this technology.Thus, it should be analyzed its impact on the tourism field.

Figure 1 .
Figure 1.Number of tourism AR/VR studies per year and category Figure 2. Word cloud with tourism context of AR/VR research Figure 3. Evolution of AR/VR papers according to context Figure 4. Evolution and number of AR/VR papers according to the stage of the tourism journey Figure 5. Evolution of AR/VR tourism publications in terms of research method