Time perception with and without a concurrent nontemporal task

Prospective time estimates were obtained from human subjects for stimulus durations ranging from 2 to 23 sec. Presence and absence of a concurrent nontemporal task was manipulated within subjects in three experiments. In addition, location of the task within temporal reproduction trials and psychophysical method were varied between groups in Experiments 2 and 3, respectively. For long-duration stimuli, the results of all three experiments conformed to results in the literature, showing a decrease in perceived duration under concurrent task conditions, in accord with attentional resource allocation models of timing. The effects of task location and psychophysical method on time estimates were also compatible with this analysis. However, psychophysical functions obtained under task conditions were fit well by power functions, an outcome that would not be anticipated on the basis of attention theory. The slopes of the functions under no-task conditions were steeper than those under task conditions. The data support the perceptual hypothesis that different sources of sensory input mediate timing under task and no-task conditions.

[1]  S. S. Stevens.  On the psychophysical law. , 1957, Psychological review.

[2]  R. Teghtsoonian,et al.  On the exponents in Stevens' law and the constant in Ekman's law. , 1971, Psychological review.

[3]  R. Rousseau,et al.  Time estimation and concurrent nontemporal processing: Specific interference from short-term-memory demands , 1993, Perception & psychophysics.

[4]  S. S. Stevens,et al.  Regression effect in psychophysical judgment , 1966 .

[5]  L. Allan.  Magnitude estimation of temporal intervals , 1983, Perception & psychophysics.

[6]  Dan Zakay,et al.  The evasive art of subjective time measurement: Some methodological dilemmas. , 1990 .

[7]  Scott W. Brown.  Time, change, and motion: The effects of stimulus movement on temporal perception , 1995, Perception & psychophysics.

[8]  Douglas Poynter,et al.  Chapter 8 Judging the Duration of Time Intervals: A Process of Remembering Segments of Experience , 1989 .

[9]  E. Poulton.  Population norms of top sensory magnitudes and S. S. Stevens’ exponents , 1967 .

[10]  M. Treisman.  Temporal discrimination and the indifference interval. Implications for a model of the "internal clock". , 1963, Psychological monographs.

[11]  Ewart A. C. Thomas,et al.  Time perception and the filled-duration illusion , 1974 .

[12]  R. Ivry,et al.  Perception and production of temporal intervals across a range of durations: evidence for a common timing mechanism. , 1995, Journal of experimental psychology. Human perception and performance.

[13]  J H Wearden,et al.  Scalar timing in temporal generalization in humans with longer stimulus durations. , 1997, Journal of experimental psychology. Animal behavior processes.

[14]  S. Holm.  A Simple Sequentially Rejective Multiple Test Procedure , 1979 .

[15]  M. Masson,et al.  Using confidence intervals in within-subject designs , 1994, Psychonomic bulletin & review.

[16]  F. Macar,et al.  Controlled attention sharing influences time estimation , 1994, Memory & cognition.

[17]  R. Luce,et al.  Measurement, scaling, and psychophysics. , 1988 .

[18]  S. Roberts,et al.  Isolation of an internal clock. , 1981, Journal of experimental psychology. Animal behavior processes.

[19]  T. F. Sawyer,et al.  Contrasting task demands alter the perceived duration of brief time intervals , 1994, Perception & psychophysics.

[20]  M. Gardner,et al.  USING CONFIDENCE INTERVALS , 1987, The Lancet.

[21]  W. N. Schoenfeld.  The Theory of reinforcement schedules , 1970 .

[22]  D. Zakay.  Time Estimation Methods—Do They Influence Prospective Duration Estimates? , 1993, Perception.

[23]  J. Gibbon,et al.  Human bisection at the geometric mean , 1991 .

[24]  H. Pashler.  STEVENS' HANDBOOK OF EXPERIMENTAL PSYCHOLOGY , 2002 .

[25]  P. A. Vroon.  Effects of presented and processed information on duration experience , 1970 .

[26]  Richard A. Block,et al.  Cognitive models of psychological time , 1992 .

[27]  J G Fetterman,et al.  A componential analysis of pacemaker-counter timing systems. , 1990, Journal of experimental psychology. Human perception and performance.

[28]  S. S. Stevens.  The Psychophysics of Sensory Function. , 1960 .

[29]  C. N. Kladopoulos,et al.  The start-stop procedure: Estimation , 1998 .

[30]  P R Killeen,et al.  How the propagation of error through stochastic counters affects time discrimination and other psychophysical judgments. , 2000, Psychological review.

[31]  D. Homa,et al.  Duration judgment and the experience of change , 1983, Perception & psychophysics.

[32]  J. Gibbon,et al.  Scalar expectancy theory and peak-interval timing in humans. , 1998, Journal of experimental psychology. Animal behavior processes.

[33]  H Eisler,et al.  Subjective duration and psychophysics. , 1975, Psychological review.

[34]  R. Block.  Prospective and Retrospective Duration Judgment: The Role of Information Processing and Memory , 1992 .

[35]  Robert Rousseau,et al.  Interference from short-term memory processing on encoding and reproducing brief durations , 1998, Psychological research.

[36]  Hannes Eisler,et al.  Experiments on subjective duration 1868-1975: A collection of power function exponents. , 1976 .

[37]  D. Zakay.  Attention allocation policy influences prospective timing , 1998 .

[38]  R. Church,et al.  Representation of time , 1990, Cognition.

[39]  Simon Grondin,et al.  When to start explicit counting in a time-intervals discrimination task: A critical point in the timing process of humans. , 1999 .

[40]  Scott W. Brown,et al.  Attention, Multiple Timing, and Psychophysical Scaling of Temporal Judgments , 1992 .

[41]  V. R. Carlson,et al.  Individual variations in time judgment and the concept of an internal clock. , 1968, Journal of experimental psychology.

[42]  K. Cheng,et al.  Analysis of single trials in pigeons' timing performance. , 1993 .

[43]  Ewart A. C. Thomas,et al.  Cognitive processing and time perception , 1975 .

[44]  K. Cheng,et al.  Memory Variance in the Peak Procedure of Timing in Pigeons , 1993 .

[45]  J. Staddon,et al.  Time and memory: towards a pacemaker-free theory of interval timing. , 1999, Journal of the experimental analysis of behavior.

[46]  Scott W. Brown.  Attentional resources in timing: Interference effects in concurrent temporal and nontemporal working memory tasks , 1997, Perception & psychophysics.

[47]  J. Gibbon.  Origins of scalar timing , 1991 .

[48]  P. Killeen,et al.  Optimal timing and the Weber function. , 1987, Psychological review.

[49]  E. Poulton.  The new psychophysics: Six models for magnitude estimation. , 1968 .

[50]  H. Lejeune.  Switching or gating? The attentional challenge in cognitive models of psychological time , 1998, Behavioural Processes.

[51]  R. E. Hicks,et al.  Concurrent processing demands and the experience of time-in-passing , 1977 .