Olfactory Experience Research Articles

Phantosmia in Parkinson's Disease: A Systematic Review of the Phenomenology of Olfactory Hallucinations.

Olfactory dysfunction is a prevalent non-motor symptom in Parkinson's disease (PD), affecting approximately 65-90% of subjects. PD patients may also report odor perception in the absence of any external source, often referred to as olfactory hallucinations (OHs) or phantosmia. This study aims to explore the current understanding of OHs in PD and offer a comprehensive overview of their prevalence and characteristics. We conducted a systematic search of the literature published on PubMed from inception to July 2023 regarding OHs in PD, following PRISMA guidelines. From the 2875 studies identified through database searching, 29 studies fulfilled the necessary criteria and underwent data extraction. The frequency of OHs in PD patients varies widely, ranging from 0.5% to 18.2%, with female prevalence ranging from 36% to 75% of the patients. Olfactory experiences may vary widely, ranging from pleasant scents to unpleasant odors. Several studies have indicated the concurrent presence of other types of hallucinations alongside phantosmia, especially visual and auditory hallucinations. OHs in PD are a type of hallucination that has been largely overlooked. To gain a deeper understanding of OHs in PD patients, the next crucial step should involve the development and validation of a dedicated questionnaire.

Social odor choice buffers drug craving.

Social interactions are rewarding and protective against substance use disorders, but it is unclear which specific aspect of the complex sensory social experience drives these effects. Here, we investigated the role of olfactory sensory experience on social interaction, social preference over cocaine, and cocaine craving in rats. First, we conducted bulbectomy on both male and female rats to evaluate the necessity of olfactory system experience on the acquisition and maintenance of volitional social interaction. Next, we assessed the effect of bulbectomy on rats given a choice between social interaction and cocaine. Finally, we evaluated the influence of olfactory sensory experience by training rats on volitional partner-associated odors, assessing their preference for partner odors over cocaine to achieve voluntary abstinence and assessing its effect on the incubation of cocaine craving. Bulbectomy impaired operant social interaction without affecting food and cocaine self-administration. Rats with intact olfactory systems preferred social interaction over cocaine, while rats with impaired olfactory sense showed a preference for cocaine. Providing access to a partner odor in a choice procedure led to cocaine abstinence, preventing incubation of cocaine craving, in contrast to forced abstinence or non-contingent exposure to cocaine and partner odors. Our data suggests the olfactory sensory experience is necessary and sufficient for volitional social reward. Furthermore, the active preference for partner odors over cocaine buffers drug craving. Based on these findings, translational research should explore the use of social sensory-based treatments utilizing odor-focused foundations for individuals with substance use disorders.

Multisensory Hallucinatory Experiences in Migraine: A Preliminary Basis for Olfactory, Somatic-Tactile, and Gustatory Auras.

Visual auras in migraine have been extensively studied, but less is known about unusual experiences in other sensory domains, including whether they should be diagnostically considered as part of aura symptoms. This study aimed to examine the prevalence of multisensory aura experiences in migraine and their phenomenologic and clinical correlates. Respondents were 729 participants with probable migraine, who completed an online study examining unusual sensory experiences. These comprised aura experiences in the auditory, visual, olfactory, somatic-tactile, and gustatory domains. Basic demographic and clinical information and migraine symptomatology were also collected. To facilitate groupwise comparisons, participants with probable migraine were divided into those with and without (visual) aura experiences. Endorsement of visual aura experiences was the highest (42.1%), whether in a single modality (44.2%) or multiple (55.8%) modalities, followed by somatic-tactile (32.0%), gustatory (21.9%), olfactory (18.6%), and auditory (11.0%) domains. Phenomenologic similarities, for instance, in frequency, personification, and controllability, existed across sensory domains. Somatic-tactile and gustatory auras conversely exhibited greater duration and negative emotional valence. Participants with probable migraine with visual aura tended to report significantly more severe migraine symptoms relative to those with nonvisual or no aura. Our findings provide preliminary indication that unusual olfactory, somatic-tactile, and gustatory experiences in migraine are common and could be clinically significant as aura symptoms. Increased clinician and patient awareness and effective management of these symptoms are essential for a holistic therapeutic approach to migraine.

The dimensionality of perceptual anomalies and their relationships with bullying victimization among Chinese adolescents: From a network perspective

Anomalous perceptual experiences in adolescents are common and may predict future psychotic disorders and other psychopathologies. However, the underlying structure and their specific relationships with bullying victimizations, a typical stressor for adolescents, remain unclear. Therefore, the current study aimed to clarify the structure of perceptual anomalies as assessed by the Cardiff Anomalous Perceptions Scale (CAPS) using exploratory graph analysis (EGA), a new factor retention method based on network psychometrics. The second aim was to explore whether specific dimensions of perceptual anomalies are particularly associated with certain forms of bullying victimization. Data from a validated sample of 1199 Chinese adolescents (56.0 % females, age range: 14–20) on perceptual anomalies and bullying victimizations were analyzed using network approaches, including EGA and mixed graphical modeling (mgm). Results showed that each anomalous perception was experienced by 13.8–50.3 % of the participants. EGA identified four dimensions: aberrant bodily perceptions, altered daily experiences, chemosensation (i.e., abnormal gustatory and olfactory experiences), and clinical psychosis (i.e., visual and auditory hallucinatory experiences). Among them, the altered daily experiences dimension possessed the highest centrality. Physical bullying and cyberbullying were directly and positively linked to two of the aberrant bodily experiences. Bootstrap analyses suggest that the results are reliable. The current findings support the existence of multiple contributive factors to perceptual anomalies and underscore the importance of bullying prevention in reducing mental health risks for adolescents, particularly the risk of psychosis.

On the Scent Trail: Arts-Informed Method Development to Support Perception and Expression of Olfactory Experiences in Aromatherapy of Women With Gynecological Cancers

Background: Talking about personal olfactory experiences is challenging because subjective, often latent reactions to odor are difficult to perceive and express. In qualitative empirical research on the effects of Aromatherapy (AT), this issue needs to be considered in data collection. Therefore, we developed a new data-collection method to support participants in perceiving and articulating their own olfactory experiences. The method development was embedded in the background study arth4WOMEN about AT for women with gynecological cancers. Method: The data-collection method was developed in five steps inspired by A rts-informed R esearch (AIR) and Creative Writing (CW). A workshop on scent and writing was conceptualized for an existing CW course ( n = 8) (step 1). The findings were condensed (step 2) into the new data-collection method called the Olfactory Journey (OLFJ), then pilot tested, discussed with qualitative research experts and adapted (step 3). The final version of the OLFJ was carried out with 15 participants of the background study arth4WOMEN as one part of a qualitative interview concept (step 4), then analyzed via qualitative content analysis (step 5). Results: The analysis of the workshop showed that pictures can be a useful tool to focus on olfactory experiences and find words to express them. Thus, in the OLFJ inner visuals were stimulated by an olfactory trigger and brought into focus through a guided instruction. The inner visuals were used as a tool to talk about the olfactory experiences. The resulting descriptions were characterized by many pictorial associations and marked by contrasts and comparisons. Discussion: The OLFJ as a data-collection method has potential to support participants in their verbal expressions of their olfactory experiences. The inclusion of creative art forms in the development process of the OLFJ was helpful and should be encouraged in future research. Further research is needed to test OLFJ validity and reliability.

Case study on the construction path of olfactory space in Jiangsu University Library

PurposeThis article explores the scientific construction of library olfactory space, based on the case of the olfactory space in the Jiangsu University library. It specifically focuses on understanding the interaction between the physical architectural space of the library and users’ olfactory perception and behavioral activities, with the ultimate goal of creating a deeply integrated olfactory experience in the Jiangsu University Library.Design/methodology/approachIn this article, an empirical research method was used to gather perceptions from 30 university student users regarding the library olfactory space and to understand their olfactory preferences and requirements for its construction. Through qualitative analysis of the interview texts, the study identified correlations between user perceptions and elements of the library olfactory space.FindingsThe qualitative analysis of user interview texts and results from the library olfactory space design experiment contributed to the design proposal for the Jiangsu University Library olfactory space. The design proposal for the Jiangsu University Library olfactory space is provided and includes library architecture, activity context, functional services, olfactory experience design and technological applications.Research limitations/implicationsThis case study takes the environment, development strategy and user needs of the Jiangsu University Library as its unique research background and as such is not universal or generalizable to other libraries.Originality/valueThis article differs from others by advocating for the innovative architectural spatial design of libraries through olfactory experience, breaking the traditional perception of libraries as solely through visual and auditory senses.

Attenuation of Odours in the Urban Outdoor Environment: A Rapid Review and Implications for the Conduct and Interpretation of Smell Walks

The assessment and documentation of visual, auditory, and olfactory sensory experiences within urban environments is an emerging focus of research that has implications for the understanding of cultural heritage as well as community mental health. The common methodology to identify, describe, and document smells within environmental settings is smell walks, where individuals walk predefined transects, identifying and locating encountered odours and odour attributes (e.g., intensity, hedonic tone). As the locations of smell walks vary (e.g., indoor and outdoor markets, urban parks, etc.), localised environmental parameters such as airflow and temperature affect the dispersion and attenuation of the odours, influencing the results. This paper presents a rapid, systematic review of the factors that influence the attenuation of odours in the urban outdoor environment, in particular, in the context of outdoor markets. Although there is an abundance of literature on wind patterns in urban canyons discussing the influence of microtopography, this can only be applied cum grano salis to outdoor markets settings. Various avenues for future research are outlined.

Time-Dependent Analysis of Human Neurophysiological Activities during an Ecological Olfactory Experience.

It has been demonstrated that odors could affect humans at the psychophysiological level. Significant research has been done on odor perception and physiological mechanisms; however, this research was mainly performed in highly controlled conditions in order to highlight the perceptive phenomena and the correlated physiological responses in the time frame of milliseconds. The present study explored how human physiological activity evolves in response to different odor conditions during an ecological olfactory experience on a broader time scale (from 1 to 90 s). Two odors, vanilla and menthol, together with a control condition (blank) were employed as stimuli. Electroencephalographic (EEG) activity in four frequency bands of interest, theta, alpha, low beta, and high beta, and the electrodermal activity (EDA) of the skin conductance level and response (SCL and SCR) were investigated at five time points taken during: (i) the first ten seconds of exposure (short-term analysis) and (ii) throughout the entire exposure to each odor (90 s, long-term analysis). The results revealed significant interactions between the odor conditions and the time periods in the short-term analysis for the overall frontal activity in the theta (p = 0.03), alpha (p = 0.005), and low beta (p = 0.0067) bands, the frontal midline activity in the alpha (p = 0.015) and low beta (p = 0.02) bands, and the SCR component (p = 0.024). For the long-term effects, instead, only one EEG parameter, frontal alpha asymmetry, was significantly sensitive to the considered dimensions (p = 0.037). In conclusion, the present research determined the physiological response to different odor conditions, also demonstrating the sensitivity of the employed parameters in characterizing the dynamic of such response during the time. As an exploratory study, this work points out the relevance of considering the effects of continuous exposure instead of short stimulation when evaluating the human olfactory experience, providing insights for future studies in the field.

Learning-dependent structural plasticity of intracortical and sensory connections to functional domains of the olfactory tubercle.

The olfactory tubercle (OT), which is a component of the olfactory cortex and ventral striatum, has functional domains that play a role in odor-guided motivated behaviors. Learning odor-guided attractive and aversive behavior activates the anteromedial (am) and lateral (l) domains of the OT, respectively. However, the mechanism driving learning-dependent activation of specific OT domains remains unknown. We hypothesized that the neuronal connectivity of OT domains is plastically altered through olfactory experience. To examine the plastic potential of synaptic connections to OT domains, we optogenetically stimulated intracortical inputs from the piriform cortex or sensory inputs from the olfactory bulb to the OT in mice in association with a food reward for attractive learning and electrical foot shock for aversive learning. For both intracortical and sensory connections, axon boutons that terminated in the OT domains were larger in the amOT than in the lOT for mice exhibiting attractive learning and larger in the lOT than in the amOT for mice exhibiting aversive learning. These results indicate that both intracortical and sensory connections to the OT domains have learning-dependent plastic potential, suggesting that this plasticity underlies learning-dependent activation of specific OT domains and the acquisition of appropriate motivated behaviors.

The Smell of Mortal Man: When the Demonic Female Preys Upon the German Pietist

AbstractIn the esoteric writings of the Medieval German Pietists, nocturnal female demons, known as lilioth, preyed upon mortal men who crossed their paths or who laid down to sleep in their territory. These lilioth could smell the scent of a man, whose body carried with it the additional value of sexual allure, and would hunt them down with their finely attuned olfactory sense. Another odor discussed in these texts, the smell of flying ointment, guaranteed invisibility and offered invulnerability to night-time travelers of both sexes which mirrors the phenomenon known in contemporary Latin sources under the term cursus. In these texts, Jewish mystics, before the dawn of the Kabbalah, rewrote the widely known folklore traditions and fairy tales common to both Jewish and Christian cultures in the Middle Ages. The study presented here is therefore aimed to provide insight into a previously underestimated chapter in Jewish esoteric and kabbalistic sensorium, namely, the olfactory experience.

The significance of children’s olfactory experiences in a Norwegian kindergarten: an olfactory researcher-practitioner collaboration

ABSTRACT This study is a researcher-practitioner action inquiry which was used to explore children’s sensory experiences with a focus on the sense of smell (olfaction). We critically considered the early childhood theories that positioned children's sensory learning within equitable, socially just early childhood approaches and connected them to an action inquiry approach. The data comprise a systematic documentation of the odours experienced by children in the classroom, an olfactory log of the kindergarten space as well as children’s ‘smellmaps’ from outdoor ‘smellwalks’. We interpret children’s olfactory experiences and reflect on the ways in which the multi-sensory approach to literacy might extend the field’s understanding of the multi-dimensional ways in which educational researchers and practitioners can cultivate their joint inquiries in early childhood education. We present implications for adopting an olfactory researcher-practitioner collaboration in early childhood and conclude that such an approach exemplifies a sensorially sensitive early childhood curriculum.

Can the machine smell? The problem of the universal olfactory dictionary

In technology research, much has been achieved in the field of visual and auditory analysis as compared to the perception of smells. This article discusses the latest advances in the field of electronic (E-nose) used to recognize the olfactory code. All studies can be conditionally divided according to the goals into: 1. Research aimed at the practical application of electronic systems in areas such as food industry, medicine, the environment, etc. 2. Research aimed at cognitive processes and psycho-emotional reactions of a person during olfactory experience, as well as the ability of a machine to predetermine human reactions to various smells. In this case, an important role is played by language, which acts as a representation of olfactory sensations. The methods of conceptual and semantic analysis are becoming more and more in demand in studies devoted to machine recognition of the olfactory code.

Improvement by application of three nanomaterials on flavor quality and physiological and antioxidant properties of tomato and their comparison

In recent years, it has been found that the flavor quality of tomato is continuously reduced compared with the original tomato varieties. Studies have found that nanomaterials can improve crop quality, but the differences and related mechanisms among different nanomaterials were not reported. In this study, nano-Se, nano-TiO2 and nano-CeO2 were spraying on tomato, and the effects of the three nanomaterials on the flavor quality and physiological and antioxidant properties of fruits were analyzed and compared. The results showed compared with nano-TiO2 and nano-CeO2, nano-Se showed more obvious positive effects. Nano-Se increased the size and weight of tomato fruits and the levels of soluble sugar, promoted the accumulation of photosynthetic pigment, decreased the content of titratable acid, and also changed the expression of related genes, finally making the fruit sweeter; it also promoted the accumulation of antioxidant substances and nutrients such as lycopene, ascorbic acid, salicylic acid, GSH, SOD and CAT and decreased the content of MDA, H2O2 and OFR thus improving the antioxidant performance of fruits; the contents of volatiles were also increased and the olfactory experience of tomato was improved. Nano-TiO2 and nano-CeO2 also improved the flavor quality and antioxidant properties of tomato, but the degree was lower than nano-Se. This experiment provided references for selecting more appropriate nanomaterials to improve tomato quality, and revealed the effects and mechanisms of different nanomaterials on tomato quality.

Chronic exposure to odors at naturally occurring concentrations triggers limited plasticity in early stages of Drosophila olfactory processing.

In insects and mammals, olfactory experience in early life alters olfactory behavior and function in later life. In the vinegar fly Drosophila, flies chronically exposed to a high concentration of a monomolecular odor exhibit reduced behavioral aversion to the familiar odor when it is reencountered. This change in olfactory behavior has been attributed to selective decreases in the sensitivity of second-order olfactory projection neurons (PNs) in the antennal lobe that respond to the overrepresented odor. However, since odorant compounds do not occur at similarly high concentrations in natural sources, the role of odor experience-dependent plasticity in natural environments is unclear. Here, we investigated olfactory plasticity in the antennal lobe of flies chronically exposed to odors at concentrations that are typically encountered in natural odor sources. These stimuli were chosen to each strongly and selectively excite a single class of primary olfactory receptor neuron (ORN), thus facilitating a rigorous assessment of the selectivity of olfactory plasticity for PNs directly excited by overrepresented stimuli. Unexpectedly, we found that chronic exposure to three such odors did not result in decreased PN sensitivity but rather mildly increased responses to weak stimuli in most PN types. Odor-evoked PN activity in response to stronger stimuli was mostly unaffected by odor experience. When present, plasticity was observed broadly in multiple PN types and thus was not selective for PNs receiving direct input from the chronically active ORNs. We further investigated the DL5 olfactory coding channel and found that chronic odor-mediated excitation of its input ORNs did not affect PN intrinsic properties, local inhibitory innervation, ORN responses or ORN-PN synaptic strength; however, broad-acting lateral excitation evoked by some odors was increased. These results show that PN odor coding is only mildly affected by strong persistent activation of a single olfactory input, highlighting the stability of early stages of insect olfactory processing to significant perturbations in the sensory environment.

The influence of sensory marketing on customer satisfaction and its behavioral intention

With the rapid development of global tourism, the emergence of hot spring hotels has met the demand for one-stop entertainment pursued by a large number of consumer groups. Therefore, the target customer market of hot spring hotels is broader than that of ordinary hotels. At the same time, sensory marketing, as an emerging marketing strategy, has gradually been favored and applied by first-class enterprises. Therefore, to have a deeper understanding of the impact of sensory marketing on hot spring hotels, this paper analyzes the actual data obtained from the questionnaire survey, that is whether the visual, olfactory, auditory, and tactile experience will have a positive impact on customers' pleasure and satisfaction, so as to affect the subsequent customer behavior intention. By confirming the relationship between sensory marketing and planning behavior theory, this study shows that sensory experience can indeed influence customers. Future behavior intention is influenced the perception of customers' emotional value. This result not only enriches the content of the marketing strategy but also provides the hot spring hotel managers with more effective methods and strategies to improve consumer loyalty.

Chemosensory Ability and Sensitivity in Health and Disease: Epigenetic Regulation and COVID-19.

Throughout the animal kingdom, our two chemical senses, olfaction and gustation, are defined by two primary factors: genomic architecture of the organisms and their living environment. During the past three years of the global COVID-19 pandemic, these two sensory modalities have drawn much attention at the basic science and clinical levels because of the strong association of olfactory and gustatory dysfunction with viral infection. Loss of our sense of smell alone, or together with a loss of taste, has emerged as a reliable indicator of COVID-19 infection. Previously, similar dysfunctions have been detected in a large cohort of patients with chronic conditions. The research focus remains on understanding the persistence of olfactory and gustatory disturbances in the post-infection phase, especially in cases with long-term effect of infection (long COVID). Also, both sensory modalities show consistent age-related decline in studies aimed to understand the pathology of neurodegenerative conditions. Some studies using classical model organisms show an impact on neural structure and behavior in offspring as an outcome of parental olfactory experience. The methylation status of specific odorant receptors, activated in parents, is passed on to the offspring. Furthermore, experimental evidence indicates an inverse correlation of gustatory and olfactory abilities with obesity. Such diverse lines of evidence emerging from basic and clinical research studies indicate a complex interplay of genetic factors, evolutionary forces, and epigenetic alterations. Environmental factors that regulate gustation and olfaction could induce epigenetic modulation. However, in turn, such modulation leads to variable effects depending on genetic makeup and physiological status. Therefore, a layered regulatory hierarchy remains active and is passed on to multiple generations. In the present review, we attempt to understand the experimental evidence that indicates variable regulatory mechanisms through multilayered and cross-reacting pathways. Our analytical approach will add to enhancement of prevailing therapeutic interventions and bring to the forefront the significance of chemosensory modalities for the evaluation and maintenance of long-term health.

Smellscaping Guiyu

Once the largest e-waste recycling and processing town in the world, Guiyu, China, was characterized by a pungent, penetrating smell of burning chemicals and plastics, commonly referred to as Guiyu Wei by both locals and officials. Shrouded in the environmental terror of unidentified toxins and chemicals, breathing had become a precarious bodily (re)action that constantly put people’s lives at risk. Taking Guiyu as its center case, this essay documents two “smell walks” in Guiyu conducted by the local community and me, respectively. It presents a prolonged material afterlife of data that is intimately intertwined with the life and livelihood of the local workforce and community and tracks the production of desensitized subjects. How do we represent a particular kind of smell or a specific form of olfactory experience? How can we communicate this message with a larger public that has little knowledge of what life is like within a chemically polluted environment? This project seeks to think about these questions in artistic terms, conceiving research-creation as an integral methodology. Through the Guiyu-inspired art series, “Synesthesia (unfinished),” I explore various possibilities of olfactory representation and the emergent relationships among smell, the environment, and our sensorium. As the centerpiece of this project, I envision “Smellscaping Guiyu” as an immersive installation that takes visitors beyond their intimate sensory knowledge and immerses them in the unfamiliar olfactory milieu fabricated by chemicals and elements from Guiyu, one of the “shadow places” at the corner of the world.

Olfactory abstraction: a communicative and metacognitive account.

The usual puzzle raised about olfaction is that of a deficit of abstraction: smells, by contrast notably with colours, do not easily lend themselves to abstract categories and labels. Some studies have argued that the puzzle is culturally restricted and that abstraction is more common outside urban Western societies. Here, I argue that the puzzle is misconstrued and should be reversed: given that odours are constantly changing and that their commonalities are difficult for humans to identify, what is surprising is not that abstract terms are rare, but that they should be used at all for olfaction. Given the nature of the olfactory environment and our cognitive equipment, concrete labels referring to sources seem most adaptive. To explain the use and presence of abstract terms, we need to examine their social and communicative benefits. Here these benefits are spelt out as securing a higher agreement among individuals varying in their olfactory experiences as well as the labels they use, as well as feeling a heightened sense of confidence in one's naming capacities. This article is part of the theme issue 'Concepts in interaction: social engagement and inner experiences'.

The invisible cloak: An olfactory experiment and tales of (re)enchantment

If consciously wearing perfume is part of an identity construction process, then could a specifically designed olfactory costume affect the interactions of those wearing it with their environment or perhaps encourage performative behaviour? If so, could narrative components or patterns emerge from this olfactory experience? Perfume might often be described or advertised as enchanting, eerie, charming or alluring among others, scents however are rarely mentioned in fairy and folk tales, the realm of enchantment par excellence. In an effort to activate the human body and the surrounding air with a potential for narrative and explore the possibility of a relationship between scent, storytelling and performativity, I developed [___], an olfactory art piece that wafted through Athens, Greece over a period of four months (September–December 2021). [___] is a scent, given to twenty participants to wear, monitor and optionally document their reactions and those of their environment spontaneously. Following the experiment, discussions with the participants revealed compelling experiences and stories, performative behaviours, fictional accounts, characters and situations at the intersection of the mundane, the creative and the magical. [___], is a redolent experiment that explores potential relationships between bodies, smell, agency, costume, performance and (re)enchantment within the contemporary urban setting.

Direct and indirect effects of multisensory modalities on visitor’ s thermal comfort in an urban park in a humid-hot climate

ABSTRACT Thermal comfort in outdoor spaces is of vital importance to human health and well-being, and affects the livability of cities. In a humid-hot region with elevated temperatures, it is difficult to improve the thermal experience of urban residents by changing objective conditions such as the microclimate. This study created a set of experience indices in different dimensions including visual, auditory, and olfactory perceptions and psychological cognitions, to explore the influencing factors and mechanisms of visitor’s thermal comfort in an urban park. We found that visual, auditory, and olfactory experience indices and psychological cognition indices were both strongly correlated with thermal comfort (Pearson correlation coefficients were above 0.3). By analyzing a survey data with a structural equation model, we found that Visual, auditory, and olfactory experiences have a complete, mediating effect on thermal comfort. Explicitly, visual, auditory, and olfactory perceptions affect thermal comfort through two mediating variables: thermal sensation and psychological cognitions. In turn, thermal sensation and psychological cognitions have a direct effect on visitor’s thermal comfort. Psychological cognitions has the largest direct effect on thermal comfort. Quantitatively, a 1-unit increase in psychological cognitions produces an increase of 0.601 units in thermal comfort. A potential approach is to improve multisensory modalities that affect necessary sensory perception and psychological cognitions of visitors. The findings of this study provide a valuable reference for the planning and design of recreational spaces in humid-hot regions and for the studies of outdoor thermal comfort.