Volberg, Gregor and Thomaschke, Roland (2017) Time-based expectations entail preparatory motor activity. CORTEX, 92. pp. 261-270. ISSN 0010-9452, 1973-8102
Full text not available from this repository. (Request a copy)Abstract
Human behavior is guided by expectations that facilitate perception of upcoming events or reaction to them. In natural settings expectations are often implicitly based on time, e.g., when making a phone call one would expect to hear either a person answering (earlier) or a voicemail greeting (later). We investigated how time-based expectations can improve performance in the absence of explicit prior information on the pending stimulus or the associated response. Visual stimuli were presented after a characteristic short or long foreperiod, and a forced-choice categorization using either the left or the right hand was required. The electroencephalogram (EEG) revealed a decrease in central 9-12 Hz power over the course of the trial. Moreover, lateralized pre-motor potentials were observed which changed polarity after the short foreperiod. At stimulus onset, amplitudes of pre-motor potentials co-varied with performance, so that higher (more negative) amplitudes were associated with slower responses to unexpected targets. Altogether, the results suggest that implicit time-based expectations entail effector-specific preparatory brain activity, which is inhibited until the expected onset time of the event. Thus, time-based expectations prepare for action. (C) 2017 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EEG ALPHA OSCILLATIONS; TEMPORAL PREPARATION; RESPONSE PREPARATION; ADVANCE INFORMATION; PREFRONTAL CORTEX; SPATIAL ATTENTION; TASK; INHIBITION; STIMULUS; SYSTEM; Expectancy; Time; EEG; LRP; Motor cortex |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Psychology and Pedagogy > Institut für Psychologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 14 Feb 2019 10:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1615 |
Actions (login required)
 |
View Item |
