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Title: Timing and Judgment in the Duration Bisection Task: Electrophysiological Analyses
Authors: NG KWUN KEI
Keywords: Interval Timing, Duration Bisection, EEG/ERP, Contingent Negative Variation (CNV), Pacemaker-Accumulator Interpretation, Temporal Attention
Issue Date: 12-Sep-2013
Citation: NG KWUN KEI (2013-09-12). Timing and Judgment in the Duration Bisection Task: Electrophysiological Analyses. ScholarBank@NUS Repository.
Abstract: The interpretation of the Contingent Negative Variation as a biomarker of the temporal accumulation process of interval timing was examined using the duration bisection task. In Experiment 1, change in the CNV slope was statistically significant at time periods critical for bisection judgment. However, the CNV amplitude did not differ statistically between trials classified as short and those as long. The temporal accumulation account was not fully supported. In Experiment 2, comparing two bisection sessions showed that the CNV was more negative and peaked in the session with anchor durations having shorter absolute magnitude. These differences did not support the proposal of a fixed-threshold temporal accumulator. In Experiment 3, the same principal component was extracted for both visual and auditory durations. It had a bilateral temporal/prefrontal topographical distribution and a stronger projection on the right prefrontal scalp area. We proposed the CNV reflects either motor preparation or temporal attention.
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