Processes of Long-Term Memory Actualization on Production of Time Intervals

Khodanovich M. Y., Bushov Y. V., Vyachistaya Y. V.

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Event-related brain potentials (ERPs) were explored in task of production of time intervals. Subjects were presented with digits (1, 3, 4, 5) of different colours on the monitor. On the first series (A) all digits corresponded to time intervals, which were to be produced by double pressing a key «space». On the second series (B) red digits corresponded to time intervals, which subject should produce by double pressing a key «space». Blue digits corresponded to number of key presses, which subject should make. Digits of other colours must be ignored. We found early differences of ERPs to stimuli of different colours only when colour of stimulus had signal significance. The found differences between the ERPs on production of time intervals and those on performance of the competing task in the piece of 350–500 ms from the visual stimulus onset, are related to the analysis of signal significance of stimulus and the choice of a motor program. The most probable correlate of accessing long-term memory for extraction of the subjective standard of time in the presence of the competing task of similar complexity is the negative component appearing at 250–150 ms before production of time interval. It is established, that the source of this component is in the parietal part of cingulated gyros of the right hemisphere.

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Issue: 2, 2006

Series of issue: Psychology

Rubric: General Psychology and Psychophysiology

Pages: 9 — 14

Downloads: 739