Circadian time perception

The variability of anticipating a meal was investigated. Sprague-Dawley rats earned food by inspecting a food source during a 3-hr interval. Food was not available at other times. In Experiment 1, the meal started 3 or 7 hr after light offset in a 12-hr light-dark cycle. Experiment 2 was conducted in constant darkness with 14-, 22-, 22.5-, 24-, 25.5-, 26-, or 34-hr intermeal intervals. Inspections increased before the meal. Rats timed intervals in the circadian range (22-26 hr) with lower variability than that for intervals outside this range (3-14 and 34 hr). Higher precision in timing selected intervals violates the scalar property. Proximity to a circadian oscillator improves timing precision. Variability may be used to identify oscillators with noncircadian periods.     

An epistemological history of time: From technology to representations

Abstract

This paper attempts to link the social history of the mechanization of time with the history of the psychological notion of time. Historical processes such as the mechanization of tower clocks from the Middle Ages onwards, the reform of the Gregorian calendar and the quarrel of the Christian and Chinese calendars characterized the modern representation of time on three points: isochrony, desacralization and abstraction. While Western societies learned to domesticate the practical aspects of time, the scholars of the Enlightenment naturalized time. They considered it a concept only related to man and used quantified time for scientific purposes. Empiricists saw time as a product of the succession of thought while idealists considered it a form necessary for the human experience to occur. Both trends agreed in removing time from nature and accepted isochrony, desaralization and abstraction as the necessary foundation for the modern notion of time.     

The perception of time

The present paper organizes and evaluates selected portions of the time perception literature. Emphasis is on data and theory concerned primarily with judgments of brief temporal intervals. Research concerning the psychophysical law for time, Weber’s law, the time-order error, and the role of nontemporal information is evaluated. This is followed by a consideration of current, quantitatively oriented, theoretical formulations for time perception.     

Extraversion-introversion and time perception

The relationship between stimuli complexity extraversion-introversion and time perception was tested. It was found that extraverts estimated the exposure duration of simple figures to be longer compared to introverts and that this discrepancy vanished in regard to complex figures. The findings were explained in terms of Hogan's (1978) model and on the basis of differential utilization of cognitive mechanisms for time perception by extraverts and introverts.     

Social contagion of time perception

To test the hypothesis that the perception of time’s passage converges towards consensus in interactive groups, 38 participants completed a “word puzzles” task in groups of four to six. Four groups performed the task interactively (Interactive Condition) and four groups performed it without interacting (Control Condition). Both intraclass correlations and within-group variance measures revealed, as predicted, that more within-group consensus emerged in the Interactive Condition (versus the Control Condition) for measures of perceived time speed and mood. Alternatives to an explanation based on the dynamics of interaction are discussed, and the results are placed in the larger scope of recent theory and research on socially shared cognition.     

Thinking about psychoanalytic curricula: an epistemological perspective

The author discusses the role that curriculum development can play in preparing psychoanalytic candidates to understand the challenges created by theoretical pluralism in our field and by the growth of knowledge in neighboring disciplines. Curriculum design can be used to encourage the development of epistemological perspectives that can serve as organizing frameworks to help candidates think critically about psychoanalytic knowledge. It is possible to teach these complex matters in a way that students find accessible and useful. The author presents exemplars taken from the curriculum at the Columbia University Center for Psychoanalytic Training and Research in New York.     

Cerebral asymmetry in time perception

Eighteen right-handed male subjects estimated the duration of dot patterns of varying numerosity which were briefly flashed to the left and right visual fields. The mean judged duration of patterns flashed to the left visual field was significantly less than the mean judged duration of patterns flashed to the right visual field. However, the duration of all patterns was underestimated, regardless of visual field. In addition, apparent duration increased linearly when plotted as a function of log duration and increased monotonically when plotted as a function of stimulus numerosity. Overall accuracy was nearly equivalent in both visual fields, but there were interactions between actual durations and visual field and between numerosity and visual field. Thomas and Weaver’s [1975) model for time perception is applied to the data, and it is suggested that the left hemisphere relies on a timer to estimate duration, while the right hemisphere relies on a visual information processor to estimate duration. nt]mis|The author would like to thank A. B. Kristofferson, S. F. Witelson, an anonymous referee, Mary Kay Fortman, and Allen Gouse for their helpful comments. Some of these data were presented at the meeting of the Midwestern Psychological     

Emotion colors time perception unconsciously

Emotion modulates our time perception. So far, the relationship between emotion and time perception has been examined with visible emotional stimuli. The present study investigated whether invisible emotional stimuli affected time perception. Using continuous flash suppression, which is a kind of dynamic interocular masking, supra-threshold emotional pictures were masked or unmasked depending on whether the retinal position of continuous flashes on one eye was consistent with that of the pictures on the other eye. Observers were asked to reproduce the perceived duration of a frame stimulus that was concurrently presented with a masked or unmasked emotional picture. As a result, negative emotional stimuli elongated the perceived duration of the frame stimulus in comparison with positive and neutral emotional stimuli, regardless of the visibility of emotional pictures. These results suggest that negative emotion unconsciously accelerates an internal clock, altering time perception.     

Simultaneous time and size perception

Judgments of the apparent duration and size of visually presented circles vary directly with the duration and size of the presented stimuli. When the frequencies of stimulus duration (short vs. long) and stimulus area (small vs. large) are varied, perceived size and duration are directly related to the frequency of the lower attribute value (short or small). These data are compared to the predictions of different information-processing models. The model which accounts for the data best is one in which it is assumed that perceived size and perceived duration grow together over the course of time spent sampling size information, and that attribute frequency affects the rate of sampling and/or the point at which sampling stops.     

Sex differences in time perception

In an experiment on discrimination of duration of auditory stimuli in the range of milliseconds 16 men and 16 women were tested. Men scored better than women in discrimination of duration as well as in required session time. These results were discussed in terms of the assumption of a neurotransmitter-related internal clock and with respect to sex differences in reaction time.