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Ergebnisse 2 Einträge
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Data from three experiments on serial perception of temporal intervals in the supra-second domain are reported. Sequences of short acoustic signals ("pips") separated by periods of silence were presented to the observers. Two types of time series, geometric or alternating, were used, where the modulus 1+δ of the inter-pip series and the base duration Tb (range from 1.1 to 6s) were varied as independent parameters. The observers had to judge whether the series were accelerating, decelerating, or uniform (3 paradigm), or to distinguish regular from irregular sequences (2 paradigm). "Intervals of subjective uniformity" (isus) were obtained by fitting Gaussian psychometric functions to individual subjects' responses. Progression towards longer base durations (Tb=4.4 or 6s) shifts the isus towards negative δs, i.e., accelerating series. This finding is compatible with the phenomenon of "subjective shortening" of past temporal intervals, which is naturally accounted for by the lossy integration model of internal time representation. The opposite effect observed for short durations (Tb=1.1 or 1.5s) remains unexplained by the lossy integration model, and presents a challenge for further research.
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Analyses of neural mechanisms of duration processing are essential for the understanding of psychological phenomena which evolve in time. Different mechanisms are presumably responsible for the processing of shorter (below 500 ms) and longer (above 500 ms) events but have not yet been a subject of an investigation with functional magnetic resonance imaging (fMRI). In the present study, we show a greater involvement of several brain regions - including right-hemispheric midline structures and left-hemispheric lateral regions - in the processing of visual stimuli of shorter as compared to longer duration. We propose a greater involvement of lower-level cognitive mechanisms in the processing of shorter events as opposed to higher-level mechanisms of cognitive control involved in longer events.
Erkunden
Team
- Wittmann (2)
Eintragsart
Sprache
- Englisch (2)
Thema
- Discrimination, Psychological/*physiology
- Acoustic Stimulation/methods (1)
- Adult (2)
- Auditory Perception/*physiology (1)
- Brain Mapping (1)
- Brain/*physiology (1)
- Cognition/physiology (1)
- Duration discrimination (1)
- Female (2)
- Humans (2)
- Interval of subjective uniformity (1)
- Judgment/physiology (1)
- Magnetic Resonance Imaging (1)
- Male (2)
- Neuropsychological Tests (1)
- Perspectival contraction of time (1)
- Photic Stimulation (1)
- Subjective shortening (1)
- Time Factors (2)
- Time perception (1)
- Time Perception/*physiology (2)
- Uniformity illusion (1)
- Visual Perception/*physiology (1)
- Young Adult (2)