Schizotypy and mental time travel

Mental time travel is the capacity to imagine the autobiographical past and future. Schizotypy is a dimensional measure of psychosis-like traits found to be associated with creativity and imagination. Here, we examine the phenomenological qualities of mental time travel in highly schizotypal individuals. After recollecting past episodes (autobiographical memory) and imagining future events (episodic future thinking), those scoring highly on positive schizotypy reported a greater sense of ‘autonoetic awareness,’ defined as a greater feeling of mental time travel and re-living/‘pre-living’ imagined events. Furthermore, in contrast to other sensory domains, imagery of the past and future episodes contained more olfactory detail in these high scorers. The results are discussed in relation to previous reports of anomalous olfactory experiences in schizotypy and heightened vividness of olfactory imagery in post-traumatic stress disorder, for which schizotypy is a risk factor.     

Making decisions with the future in mind: Developmental and comparative identification of mental time travel

Mechanisms that produce behavior which increase future survival chances provide an adaptive advantage. The flexibility of human behavior is at least partly the result of one such mechanism, our ability to travel mentally in time and entertain potential future scenarios. We can study mental time travel in children using language. Current results suggest that key developments occur between the ages of three to five. However, linguistic performance can be misleading as language itself is developing. We therefore advocate the use of methodologies that focus on future-oriented action. Mental time travel required profound changes in humans’ motivational system, so that current behavior could be directed to secure not just present, but individually anticipated future needs. Such behavior should be distinguishable from behavior based on current drives, or on other mechanisms. We propose an experimental paradigm that provides subjects with an opportunity to act now to satisfy a need not currently experienced. This approach may be used to assess mental time travel in nonhuman animals. We conclude by describing a preliminary study employing an adaptation of this paradigm for children.     

The stability of visual perspective and vividness during mental time travel

When remembering or imagining, people can experience an event from their own eyes, or as an outside observer, with differing levels of vividness. The perspective from, and vividness with, which a person remembers or imagines has been related to numerous individual difference characteristics. These findings require that phenomenology during mental time travel be trait-like—that people consistently experience similar perspectives and levels of vividness. This assumption remains untested. Across two studies (combined N = 295), we examined the stability of visual perspective and vividness across multiple trials and timepoints. Perspective and vividness showed weak within-session stability when reported across just a few trials but showed strong within-session stability when sufficient trials were collected. Importantly, both visual perspective and vividness demonstrated good-to-excellent across-session stability across different delay intervals (two days to six weeks). Overall, our results suggest that people dependably experience similar visual phenomenology across occurrences of mental time travel.     

Future-oriented mental time travel in individuals with disordered gambling

This study investigated the ability of individuals with disordered gambling to imagine future events. Problem gamblers (n = 35) and control participants (n = 35) were asked to imagine positive and negative future events for three temporal distances (one week, one year, 5–10 years). Then, a variety of phenomenological aspects of their future thoughts (e.g., sensory and contextual details, autonoetic consciousness) were rated. Compared to control subjects, problem gamblers generated fewer positive and negative events across all temporal distances, an impairment that was correlated to verbal fluency scores. Furthermore, problem gamblers rated imagined events as containing fewer sensory and contextual details, and lacking autonoetic consciousness. These findings demonstrate that problem gambling is associated with a reduced future-oriented mental time travel ability and, in particular, with diminished autonoetic consciousness when imagining future events.     

Being (un)moved by mental time travel

Mental imagery of events in the past or future, and of unpleasant or pleasant events, has been found to lead to spontaneous backward/forward bodily motions. Both time and emotion are represented along a spatial continuum, and activation of these representations seems to be simulated in spontaneous changes in body posture. We performed a conceptual replication and extension of an earlier study by Miles, Nind, and Macrae (2010) who reported clear postural effects when thinking of the past and the future. We additionally tested whether changes in posture appear when thinking of an emotional event. Volunteers engaged in mental imagery, involving combinations of time intervals and emotions. We simultaneously recorded center-of-pressure (COP) changes. Results revealed neither an effect of imagery of time nor of emotion on body posture. We conclude that embodied effects of imagery of abstract items on body posture may be less robust than suggested by previous literature.     

Children's understanding of embarrassment: Integrating mental time travel and mental state information

The current study investigated 4‐ to 8‐year‐olds’ (N = 81) understanding of embarrassment and their ability to integrate temporal and mental state information to predict and explain emotions. Participants heard stories describing characters commit trivial social transgressions, and then the next day, characters found themselves in the same situation that led to the previous transgression. For some story endings, participants were asked to predict and explain how the character felt, and for others, participants were told the character started to feel embarrassed and they were asked to explain why. Participants’ responses were coded and analysed using nonparametric statistical tests. Kruskal–Wallis analyses revealed significant developments occur between 6 and 8 years in children's understanding of embarrassment and their ability to explain individual's emotion as caused by anticipating the reoccurrence of a previous embarrassing event. Younger children demonstrated a basic knowledge of embarrassment but failed to demonstrate more advanced understanding of the emotion. Findings from the current study indicate children reach a more mature understanding of embarrassment and the implications of committing social transgressions between 7 and 8 years. Finally, the current study contributes to the literature on children's ability to infer mental states and temporally connect experiences.     

The impact of perceived self-efficacy on mental time travel and social problem solving

Current models of autobiographical memory suggest that self-identity guides autobiographical memory retrieval. Further, the capacity to recall the past and imagine one's self in the future (mental time travel) can influence social problem solving. We examined whether manipulating self-identity, through an induction task in which students were led to believe they possessed high or low self-efficacy, impacted episodic specificity and content of retrieved and imagined events, as well as social problem solving. Compared to individuals in the low self efficacy group, individuals in the high self efficacy group generated past and future events with greater (a) specificity, (b) positive words, and (c) self-efficacious statements, and also performed better on social problem solving indices. A lack of episodic detail for future events predicted poorer performance on social problem solving tasks. Strategies that increase perceived self-efficacy may help individuals to selectively construct a past and future that aids in negotiating social problems.     

Eye movements during mental time travel follow a diagonal line

Recent research showed that past events are associated with the back and left side, whereas future events are associated with the front and right side of space. These spatial–temporal associations have an impact on our sensorimotor system: thinking about one’s past and future leads to subtle body sways in the sagittal dimension of space (Miles, Nind, & Macrae, 2010). In this study we investigated whether mental time travel leads to sensorimotor correlates in the horizontal dimension of space. Participants were asked to mentally displace themselves into the past or future while measuring their spontaneous eye movements on a blank screen. Eye gaze was directed more rightward and upward when thinking about the future than when thinking about the past. Our results provide further insight into the spatial nature of temporal thoughts, and show that not only body, but also eye movements follow a (diagonal) “time line” during mental time travel.     

Resisting temptation and overcoming procrastination: The roles of mental time travel and metacognition

Phenomenology and the Cognitive Sciences - We tend to seek immediate gratification at the expense of long-term reward. In fact, the more distant a reward is from the present moment?the more we tend...     

Involuntary and voluntary mental time travel in high and low worriers

Worry as a trait is an individual's general tendency to become worried, which in severe cases is associated with the diagnosis Generalised Anxiety Disorder. Mental time travel (MTT) is the ability to mentally project oneself into one's personal past or future, in terms of memories of personal past events or projections of possible events in the personal future. MTT can be voluntarily initiated or occur involuntarily. The current exploratory study investigated involuntary and voluntary MTT in the context of trait worry, thereby bringing together research on worry and MTT. High (N=20) and low (N=16) worriers recorded involuntary and voluntary autobiographical memories and future projections using a structured diary method. We predicted that MTT in high worriers would show signs of cognitive avoidance, such as reduced emotional intensity, more observer perspective, less visual imagery, or coming up with overgeneral or less self-relevant events. We found only partial support for our hypotheses in that high worriers rated personal memories and future projections lower on measures of self-relevance than did low worriers.     

Storytelling agents: why narrative rather than mental time travel is fundamental

I propose that we can explain the contribution of mental time travel to agency through understanding it as a specific instance of our more general capacity for narrative understanding. Narrative understanding involves the experience of a pre-reflective and embodied sense of self, which co-emerges with our emotional involvement with a sequence of events (Velleman 2003). Narrative understanding of a sequence of events also requires a ‘recombinable system’, that is, the ability to combine parts to make myriad sequences. Mental time travel shares these two characteristics: it involves an embodied sense of self and the ability to create novel scenarios. What is unique about mental time travel is that it is a story explicitly about our selves, and it involves metarepresentation. Agency is enabled by narrative understanding when we are able to put our current situation into a larger narrative context, whereby some possible actions, but not others, make sense. However, new features of agency are enabled when we understand stories that are explicitly about our selves: we gain the ability to plan and act on plans.     

Personality and mental time travel: a differential approach to autonoetic consciousness

Recent research on autonoetic consciousness indicates that the ability to remember the past and the ability to project oneself into the future are closely related. The purpose of the present study was to confirm this proposition by examining whether the relationship observed between personality and episodic memory could be extended to episodic future thinking and, more generally, to investigate the influence of personality traits on self-information processing in the past and in the future. Results show that Neuroticism and Harm Avoidance predict more negative past memories and future projections. Other personality dimensions exhibit a more limited influence on mental time travel (MTT). Therefore, our study provide an additional evidence to the idea that MTT into the past and into the future rely on a common set of processes by which past experiences are used to envision the future.     

Collective mental time travel: remembering the past and imagining the future together

Synthese - Bringing research on collective memory together with research on episodic future thought, Szpunar and Szpunar (Mem Stud 9(4):376–389, 2016) have recently developed the concept of...     

Prospective and retrospective time perception are related to mental time travel: Evidence from Alzheimer’s disease

Unlike prospective time perception paradigms, in which participants are aware that they have to estimate forthcoming time, little is known about retrospective time perception in normal aging and Alzheimer’s disease (AD). Our paper addresses this shortcoming by comparing prospective and retrospective time estimation in younger adults, older adults, and AD patients. In four prospective tasks (lasting 30 s, 60 s, 90 s, or 120 s) participants were asked to read a series of numbers and to provide a verbal estimation of the reading time. In four other retrospective tasks, they were not informed about time judgment until they were asked to provide a verbal estimation of four elapsed time intervals (lasting 30 s, 60 s, 90 s, or 120 s). AD participants gave shorter verbal time estimations than older adults and younger participants did, suggesting that time is perceived to pass quickly in these patients. For all participants, the duration of the retrospective tasks was underestimated as compared to the prospective tasks and both estimations were shorter than the real time interval. Prospective time estimation was further correlated with mental time travel, as measured with the Remember/Know paradigm. Mental time travel was even higher correlated with retrospective time estimation. Our findings shed light on the relationship between time perception and the ability to mentally project oneself into time, two skills contributing to human memory functioning. Finally, time perception deficits, as observed in AD patients, can be interpreted in terms of dramatic changes occurring in frontal lobes and hippocampus.     

Mereology and time travel

Philosophical Studies - Core principles of mereology have been questioned by appealing to time travel scenarios. This paper questions the methodology of employing time travel scenarios to argue...