<p>Humans and animals have remarkable capabilities in keeping time and using time as a guide to orient their learning and decision making. Psychophysical models of timing and time perception have been proposed for decades and have received behavioral, anatomical and pharmacological data support. However, despite numerous studies that aimed at delineating the neural underpinnings of interval timing, a complete picture of the neurobiological network of timing in the seconds-to-minutes range remains elusive. Based on classical interval timing protocols and proposing a Timing, Immersive Memory and Emotional Regulation (TIMER) test battery, the author investigates the contributions of the dorsal and ventral hippocampus as well as the dorsolateral and the dorsomedial striatum to interval timing by comparing timing performances in mice after they received cytotoxic lesions in the corresponding brain regions. On the other hand, a timing-based theoretical framework for the emergence of conscious experience that is closely related to the function of the claustrum is proposed so as to serve both biological guidance and the research and evolution of “strong” artificial intelligence. Finally, a new “Double Saturation Model of Interval Timing” that integrates the direct- and indirect- pathways of striatum is proposed to explain the set of empirical findings.</p> / Dissertation

M.Ed. (Educational Psychology) / Please refer to full text to view abstract

Empirical work investigating children's temporal representations has included investigations of children's awareness of the past, present and future; their understanding of temporal order and their representation of duration. Previous work on children's temporal awareness leads to the question of whether children can access cognitive representations of durations in situations where the temporal aspects of the task are not made directly apparent either in the information given prior to stimulus presentation or in the subsequent question. There is very little evidence to indicate whether these representations might be accessed in the absence of any specific reference to the temporal aspects of the procedure. The empirical work in this thesis focuses on children's developing representation of duration in a procedure that avoids making specific reference to the temporal aspects of the task, in a context more closely analogous to their real world experiences where durations occur in the absence of salient prompts and cues. Results Data from over three hundred children who participated in the seven experiments in this series are encouraging and suggest that by the age of six years children do become able to differentially represent durations of 10 and 25 seconds in a procedure where no explicit reference was made to the temporal aspects of the experience, and the ability to differentially represent durations of 25 and 40 seconds, in this context, emerges later in development, at around eight years of age. 2 Conclusions This series 0 xperiments indicates that by six years of age children are able to represent durations in the absence of explicit reference to the temporal aspect of the task, and they are able to differentially represent durations of 10 and 25 seconds. Around eight years of age they are able to differentially represent durations of 25 and 40 seconds However whilst these findings indicate that children of six years and above may be able to differentially represent durations in this range.the inconsistencies in performance in the series of experiments suggest that the ability may be fragile. Whilst children in this age range are able to demonstrate the ability to code durations the limiting factors on their ability to do so in real world contexts remain unclear. Short abstract. Word count: 363.

Abstract not available

Thesis (Ph. D.)--State University of New York at Buffalo, 2001. / "August 23, 2001." Includes bibliographical references (p. 371-389). Also available in print.

Thesis (Psy. D.)--Indiana University of Pennsylvania. / Includes bibliographical references.

Thesis (Ph. D.)--University of California, San Diego, and San Diego State University, 2003. / Vita. Includes bibliographical references (leaves 98-102).

Delay discounting, the belief that rewards decline in value over time, is a phenomenon observed in several clinical disorders, including Attention Deficit / Hyperactivity Disorder (ADHD), substance abuse disorders, and other impulse control disorders. Delay discounting behavior is characterized by a tendency to choose smaller, more immediate rewards over larger, more delayed rewards. This tendency has been associated with behavioral impulsivity and inability to delay gratification observed in the aforementioned clinical disorders. It has been suggested that time perception may be a salient feature of delay discounting. If the larger, longer-term reward is perceived as being more temporally remote, its relative value decreases and is associated with greater cost, and one becomes more likely to choose the more immediate reward over the longer-term (though optimal) choice. Time perception has been studied in clinical populations, with increased variability of responses as well as both under-production and overestimation of time intervals observed in those with ADHD and other disorders associated with impulsivity. The present study used informational feedback via a metronome to change belief regarding duration of a second--either increasing or decreasing it by approximately 20%. Participants were 132 college-aged students with and without a diagnosis of ADHD. Measures of impulsivity and ADHD symptomatology were collected as well, and participants completed several cognitive tasks measuring working memory and processing speed to explore the impacts of these measures on delay discounting and time perception. While participants were able to reliably incorporate the altered second belief into short estimations of time (i.e., less than a minute), the manipulation failed to generalize to longer-duration temporal estimations, and it did not affect delay discounting. Neither ADHD symptomatology, impulsivity, nor performance on the cognitive tasks were related to delay discounting behaviors, though a working memory measure was correlated with baseline (pre-manipulation) time and one longer duration estimation. This lends support to a relationship between working memory and temporal perception, though the relationship between temporal perception and delay discounting remains elusive. Directions for future studies to clarify the role of temporal processing and ADHD in delay discounting are discussed. / text

No description available.

This thesis represents a work of basic research into dimensions of time and space, referred to as temporality, in the condition Alzheimer's dementia. In this theoretical, text-based study, temporality was explored as a dual exposition, in ordinary functioning and in impaired functioning. As expected, the influence of time and space, was found to enter each experience and was observable in every facet of human endeavour and behaviour. Significantly, however, fundamental new interpretations were developed regarding the role of temporality in human life and functioning. Temporality was identified as an essential, common component of both cognitive functions and cohesive identity construction in a unified view of body and mind. As an illustration and clarification of this concept of temporality as a subjective, psychological clock, an innovative framework, the Personal Space-Time model was developed.