Timing for the absence of a stimulus: the gap paradigm reversed.

Contrary to data showing sensitivity to nontemporal properties of timed signals, current theories of interval timing assume that animals can use the presence or absence of a signal as equally valid cues as long as duration is the most predictive feature. Consequently, the authors examined rats' behavior when timing the absence of a visual or auditory stimulus in trace conditioning and in a "reversed" gap procedure. Memory for timing was tested by presenting the stimulus as a reversed gap into its timed absence. Results suggest that in trace conditioning (Experiment 1), rats time for the absence of a stimulus by using its offset as a time marker. As in the standard gap procedure, the insertion of a reversed gap was expected to "stop" rats' internal clock. In contrast, a reversed gap of 1-, 5-, or 15-s duration "reset" the timing process in both trace conditioning (Experiment 2) and the reversed gap procedure (Experiment 3). A direct comparison of the standard and reversed gap procedures (Experiment 4) supported these findings. Results suggest that attentional mechanisms involving the salience or content of the gap might contribute to the response rule adopted in a gap procedure.

[1]  L. Saksida,et al.  Properties of time-place learning by pigeons, Columba livia , 1994, Behavioural Processes.

[2]  B. L. Brown,et al.  Sign and goal tracking during delay and trace autoshaping in pigeons , 1993 .

[3]  Joseph D. Allen,et al.  Is the hippocampus involved in temporal discrimination and the memory of short intervals? , 1997, The International journal of neuroscience.

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

[5]  Donald M. Wilkie,et al.  Subjective shortening: A model of pigeons' memory for event duration. , 1983 .

[6]  S. Grossberg,et al.  A neural network model of adaptively timed reinforcement learning and hippocampal dynamics. , 1992, Brain research. Cognitive brain research.

[7]  R. Block,et al.  The role of attention in time estimation processes , 1996 .

[8]  JOHN W. Moore,et al.  Auditory differential conditioning of the rabbit nictitating membrane response: IV. Training based on stimulus offset and the effect of an intertriai tone , 1969 .

[9]  T. Malim,et al.  Introduction Comparative psychology , 1998 .

[10]  Russell M. Church,et al.  Short-term memory for time intervals , 1980 .

[11]  S. Cabeza de Vaca,et al.  Internal clock and memory processes in animal timing. , 1994, Journal of experimental psychology. Animal behavior processes.

[12]  E A Wasserman,et al.  Trace autoshaping: Acquisition, maintenance, and path dependence at long trace intervals. , 1981, Journal of the experimental analysis of behavior.

[13]  S. Goldstone,et al.  Studies of Auditory-Visual Differences in Human Time Judgment: 1. Sounds are Judged Longer than Lights , 1974, Perceptual and motor skills.

[14]  J. Gibbon,et al.  Differential effects of auditory and visual signals on clock speed and temporal memory. , 2000, Journal of experimental psychology. Human perception and performance.

[15]  E. Fischer.  Conditioned Reflexes , 1942, American journal of physical medicine.

[16]  E. Kehoe,et al.  Real-time factors in the rabbit’s nictitating membrane response to pulsed and serial conditioned stimuli , 1991 .

[17]  D. Marquardt.  An Algorithm for Least-Squares Estimation of Nonlinear Parameters , 1963 .

[18]  R M Church,et al.  Properties of the Internal Clock a , 1984, Annals of the New York Academy of Sciences.

[19]  Russell M. Church,et al.  Control of an internal clock. , 1978 .

[20]  Warren H. Meck,et al.  Memory mixing in duration bisection. , 1998 .

[21]  A. Machado.  Learning the temporal dynamics of behavior. , 1997, Psychological review.

[22]  J. Hopson.  Gap timing and the spectral timing model , 1999, Behavioural Processes.

[23]  INTERTRIAL RESPONDING AND CS INTENSITY IN CLASSICAL EYELID CONDITIONING. , 1964, Journal of experimental psychology.

[24]  S. Goldstone,et al.  Light intensity and judged duration , 1978 .

[25]  Stephen Grossberg,et al.  Neural dynamics of adaptive timing and temporal discrimination during associative learning , 1989, Neural Networks.

[26]  J. Staddon.  Temporal control, attention, and memory. , 1974 .

[27]  Lorraine G. Allan,et al.  The Internal Clock Revisited , 1992 .

[28]  G. Ellison,et al.  DIFFERENTIAL SALIVARY CONDITIONING TO TRACES. , 1964, Journal of Comparative and Physiological Psychology.

[29]  P. Killeen,et al.  A behavioral theory of timing. , 1988, Psychological review.

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

[31]  A. Santi,et al.  Pigeons’ memory for empty time intervals marked by visual or auditory stimuli , 1999 .

[32]  P. Kraemer,et al.  Signal intensity and duration estimation in rats , 1995, Behavioural Processes.

[33]  J Staddon,et al.  Time, trace, memory. , 1999, Journal of the experimental analysis of behavior.

[34]  R M Church,et al.  Scalar Timing in Memory , 1984, Annals of the New York Academy of Sciences.

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

[36]  Ralph R. Miller,et al.  Temporal encoding in trace conditioning , 1995 .

[37]  P. Kraemer,et al.  The influence of stimulus attributes on duration matching-to-sample in pigeons , 1997 .

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

[39]  P. Holland.  CS-US interval as a determinant of the form of Pavlovian appetitive conditioned responses. , 1980, Journal of experimental psychology. Animal behavior processes.

[40]  C. Buhusi,et al.  Timing in simple conditioning and occasion setting: a neural network approach , 1999, Behavioural Processes.

[41]  M. C. Smith,et al.  CS-US interval and US intensity in classical conditioning of the rabbit's nictitating membrane response. , 1968, Journal of comparative and physiological psychology.

[42]  R. Church,et al.  Hippocampus, time, and memory. , 1984, Behavioral neuroscience.

[43]  John W. Moore,et al.  Conditioned stimuli are occasion setters. , 1998 .

[44]  R. Church,et al.  Separation of hippocampal and amygdaloid involvement in temporal memory dysfunctions , 1987, Brain Research.

[45]  W. Meck,et al.  Reinforcement-induced within-trial resetting of an internal clock , 1999, Behavioural Processes.

[46]  Warren H. Meck,et al.  Modality-specific circadian rhythmicities influence mechanisms of attention and memory for interval timing , 1991 .

[47]  W A Roberts,et al.  Timing light and tone signals in pigeons. , 1989, Journal of experimental psychology. Animal behavior processes.

[48]  N. Schneiderman.  Interstimulus interval function of the nictitating membrane response of the rabbit under delay versus trace conditioning. , 1966 .