Effects of Ayahuasca on Gratitude and Relationships with Nature: A Prospective, Naturalistic Study.

Qualitative studies and anecdotal reports suggest that experiences with ayahuasca, a psychedelic brew found in Central and South America, may be followed by individuals enduringly feeling more grateful and connected to nature. Yet, to date, these changes have been understudied. Here, participants (N = 54) completed validated surveys related to gratitude, nature relatedness, and nature appreciation one-week before, one-week after, and one-month after attending an ayahuasca retreat center. Compared to baseline, there was a significant increase in gratitude, nature relatedness, and nature appreciation at the one-week and one-month follow-ups. Ratings of mystical-type experiences and awe, but not ego dissolution, during participants' ayahuasca sessions were weakly-to-moderately correlated with these increases. The number of ayahuasca ceremonies attended at the retreat was not related to change in outcomes, underscoring the importance of the quality rather than the quantity of the experiences in post-acute change. Lastly, participant age was negatively related to the occurrence of mystical-type experiences and awe, supporting literature indicating blunted psychedelic effects with increased age. In the context of study limitations, the results suggest that mystical-type experiences and awe occasioned by ayahuasca may be linked to prosocial changes in gratitude and relationships with nature that may be beneficial to mental health.

Predicting Reactions to Psychedelic Drugs: A Systematic Review of States and Traits Related to Acute Drug Effects.

Psychedelic drugs are increasingly being incorporated into therapeutic contexts for the purposes of promoting mental health. However, they can also induce adverse reactions in some individuals, and it is difficult to predict before treatment who is likely to experience positive or adverse acute effects. Although consideration of setting and dosage as well as excluding individuals with psychotic predispositions has thus far led to a high degree of safety, it is imperative that researchers develop a more nuanced understanding of how to predict individual reactions. To this end, the current systematic review coalesced the results of 14 studies that included baseline states or traits predictive of the acute effects of psychedelics. Individuals high in the traits of absorption, openness, and acceptance as well as a state of surrender were more likely to have positive and mystical-type experiences, whereas those low in openness and surrender or in preoccupied, apprehensive, or confused psychological states were more likely to experience acute adverse reactions. Participant sex was not a robust predictor of drug effects, but 5-HT2AR binding potential, executive network node diversity, and rACC volume may be potential baseline biomarkers related to acute reactions. Finally, increased age and experience with psychedelics were individual differences related to generally less intense effects, indicating that users may become slightly less sensitive to the effects of the drugs after repeated usage. Although future well-powered, placebo-controlled trials directly comparing the relative importance of these predictors is needed, this review synthesizes the field's current understanding of how to predict acute reactions to psychedelic drugs.

Psychedelic drugs and perception: a narrative review of the first era of research.

Psychedelic drugs are well-known for transiently altering perception, and in particular, for their visual effects. Although scientific interest into the substances' effects on perception increased during the first era of psychedelic research during the early to mid-20th century, there is currently no source where these findings have been synthesized. In addressing this gap, the current narrative review found that psychedelics were examined for their influences across all levels of the visual system (e.g., retinal, cortical, subcortical, simple visual processing, complex imagery, hallucinations). Psychedelics were also shown to affect auditory discrimination/generalization, neural correlates of auditory processing, and led to auditory hallucinations in subsets of participants. Several studies demonstrated that psychedelics can distort representations of body schema and time perception. Concerns regarding methodological standards of this era are a limitation to the findings and are discussed. Collectively, this review preserves and increases the accessibility of the work done by pioneering psychedelic/perception researchers, synthesizes findings, and critically analyzes areas of discrepancy to inform future studies.

Psychedelics and virtual reality: parallels and applications.

Psychedelic drugs and virtual reality (VR) each have the capacity to disrupt the rigidity and limitations of typical conscious experience. This article delineates the parallels among psychedelic and VR states as well as their potential synergistic applications in clinical and recreational settings. Findings indicate that, individually, psychedelics and VR are used in analogous ways to alter sensory experience and evoke awe. They are also both used in tandem with traditional therapies to treat a variety of mood disorders; their shared capacity to transiently alter perspective and disrupt rigid patterns of mental experience may underly their analogous and transdiagnostic therapeutic uses. In terms of their combined applications, a number of recreational users currently utilize psychedelics and VR together to enhance their experience. We propose that VR may be a useful tool for preparing hallucinogen-naïve participants in clinical trials for the sensory distortions experienced in psychedelic states. Given the critical role of "setting" in psychedelic treatment outcomes, we also detail how VR could be used to optimize the environment in psychedelic sessions. Finally, we provide considerations for future studies and detail how advancements in psychedelic and VR research can inform one another. Collectively, this article outlines a number of connections between psychedelics and VR, and, more broadly, is representative of growing scientific interest into the interactions among technology, psychopharmacology, and mental health.

Meditation alters representations of peripersonal space: Evidence from auditory evoked potentials.

Meditation commonly gives rise to the feeling that the self and the surrounding world are no longer separate, as if the boundary between them has dissolved. We propose this may occur due to alterations in representations of peripersonal space (PPS), the reachable space surrounding the body which is integral to a sense of where one's bodily "self" is located in space. Thirty-one participants completed an auditory oddball paradigm before and after a guided meditation, during which we measured their P3 evoked potential, a marker of attentional salience. Pre-meditation, participants exhibited an enhanced attentional response to stimuli presented within PPS, relative to beyond PPS. Post-meditation, this PPS attentional enhancement was negated, with no distinction between responses to stimuli within versus beyond PPS. The results suggest that meditation leads to a constriction of PPS boundaries, even in novice meditators, elucidating one potential cause of the perceptual changes associated with meditation.

Long-term effects of psychedelic drugs: A systematic review.

Research into the basic effects and therapeutic applications of psychedelic drugs has grown considerably in recent years. Yet, pressing questions remain regarding the substances' lasting effects. Although individual studies have begun monitoring sustained changes, no study to-date has synthesized this information. Therefore, this systematic review aims to fill this important gap in the literature by synthesizing results from 34 contemporary experimental studies which included classic psychedelics, human subjects, and follow-up latencies of at least two weeks. The bulk of this work was published in the last five years, with psilocybin being the most frequently administered drug. Enduring changes in personality/attitudes, depression, spirituality, anxiety, wellbeing, substance misuse, meditative practices, and mindfulness were documented. Mystical experiences, connectedness, emotional breakthrough, and increased neural entropy were related to these long-term changes in psychological functioning. Finally, with proper screening, preparation, supervision, and integration, limited aversive side effects were noted by study participants. Future researchers should focus on including larger and more diverse samples, lengthier longitudinal designs, stronger control conditions, and standardized dosages.

Slowhand: Does time perception change in peri-hand space?

A variety of attentional and perceptual changes occur in peri-hand space, including increases in visual temporal acuity. These changes in cognition have been related to an increase in magnocellular visual processing. Other magnocellular-related processes have been shown to enhance temporal sensitivity and lead to time overestimation. We hypothesized that a similar slowing of time perception would occur in peri-hand space. To this end, we had participants complete either a temporal bisection task or a verbal time estimation task with their hands near to or far from the test stimuli. Contrary to our predictions, we found no differences in time perception in peri-hand space. We situate our findings within the context of a contemporaneous study by Qi, Wang, He, and Du (2019), which produced conflicting results when using a temporal reproduction task to investigate the same phenomenon. The disparate results might relate to the fragility of peri-hand effects and/or to the tasks tapping into different aspects of time perception. Further research will be needed to fully elucidate the nuances of peri-hand space and temporal processing.

Beyond LSD: A Broader Psychedelic Zeitgeist during the Early to Mid-20th Century.

During the 1950s and 1960s, there was a tremendous surge in research into the effects of psychedelic drugs. When discussing this period of research, the discovery of the psychoactive properties of LSD in 1943 is often presented as the main, and sometimes only, driving force of the boom in research. This "Great Person," or "Great Chemical," historiographical lens fails to acknowledge other factors that were fundamental in setting the stage for the research. In particular, other psychedelic drugs, such as mescaline, were already being probed for their uses in psychotherapy and as models for psychosis before the effects of LSD had been discovered. Psilocybin and other classical psychedelics had also been discovered by Western researchers around the same time as the synthesis of LSD. Additionally, many of the dominant zeitgeists (e.g., pharmacological, psychoanalytic, and humanistic) in psychology during this period were congruent with psychedelic research. This article argues that while the discovery of LSD may have been a catalyst for psychedelic research in the 1950s and '60s, there was a broader psychedelic zeitgeist that deserves acknowledgement for setting the stage.

Are Older Adults Less Embodied? A Review of Age Effects through the Lens of Embodied Cognition.

Embodied cognition is a theoretical framework which posits that cognitive function is intimately intertwined with the body and physical actions. Although the field of psychology is increasingly accepting embodied cognition as a viable theory, it has rarely been employed in the gerontological literature. However, embodied cognition would appear to have explanatory power for aging research given that older adults typically manifest concurrent physical and mental changes, and that research has indicated a correlative relationship between such changes. The current paper reviews age-related changes in sensory processing, mental representation, and the action-perception relationship, exploring how each can be understood through the lens of embodied cognition. Compared to younger adults, older adults exhibit across all three domains an increased tendency to favor visual processing over bodily factors, leading to the conclusion that older adults are less embodied than young adults. We explore the significance of this finding in light of existing theoretical models of aging and argue that embodied cognition can benefit gerontological research by identifying further factors that can explain the cause of age-related declines.

Spatial representations in older adults are not modified by action: Evidence from tool use.

Theories of embodied perception hold that the visual system is calibrated by both the body schema and the action system, allowing for adaptive action-perception responses. One example of embodied perception involves the effects of tool use on distance perception, in which wielding a tool with the intention to act upon a target appears to bring that object closer. This tool-based spatial compression (i.e., tool-use effect) has been studied exclusively with younger adults, but it is unknown whether the phenomenon exists with older adults. In this study, we examined the effects of tool use on distance perception in younger and older adults in 2 experiments. In Experiment 1, younger and older adults estimated the distances of targets just beyond peripersonal space while either wielding a tool or pointing with the hand. Younger adults, but not older adults, estimated targets to be closer after reaching with a tool. In Experiment 2, younger and older adults estimated the distance to remote targets while using either a baton or a laser pointer. Younger adults displayed spatial compression with the laser pointer compared to the baton, although older adults did not. Taken together, these findings indicate a generalized absence of the tool-use effect in older adults during distance estimation, suggesting that the visuomotor system of older adults does not remap from peripersonal to extrapersonal spatial representations during tool use.

Age-related changes in attentional reference frames for peripersonal space.

Neurological changes in older adults suggest that their mental representation of peripersonal space, the space around their bodies, might be degraded compared with that of young adults. These changes may lead to differences in how attention is allocated within peripersonal space, affecting how older adults plan and guide their actions. In the present study, we show that there are indeed profound differences between the spatial representations of older and young adults: In a task involving simple hand movements, young adults adopted an attentional reference frame centered on the hand, and older adults adopted a reference frame centered on the body. Such differences may help to explain age-related changes observed in the performance of many common movement tasks.

Watch this! Observed tool use affects perceived distance.

Recent research has shown that being able to interact with an object causes it to be perceived as being closer than objects that cannot be interacted with. In the present study, we examined whether that compression of perceived space would be experienced by people who simply observed such interactions by others with no intention of performing the action themselves. Participants judged the distance to targets after observing an actor reach to an otherwise unreachable target with a tool (Experiment 1) or illuminate a distant target with a laser pointer (Experiment 2). Observing either type of interaction caused a compression of perceived space, revealing that a person's perception of space can be altered through mere observation. These results indicate that shared representations between an actor and observer are engaged at the perceptual level easily and perhaps automatically, even in the absence of cooperation or an observer's own intention to interact.

Visuomotor binding in older adults.

Action integration is the process through which actions performed on a stimulus and perceptual aspects of the stimulus become bound as a unitary object. This process appears to be controlled by the dopaminergic system in the prefrontal cortex, an area that is known to decrease in volume and dopamine functioning in older adults. Although the decline should lead to reduced action integration in older adults, we found equivalent integration in both young and older adults. This indicates that older adults may be able to compensate for their dopaminergic deficiencies by activating additional neural networks that are not used by young adults.