| Changing the "when" and "what" of intended actions. | |
| | |
MedLine Citation:
|
PMID: 19710381 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Humans often have to modify the timing and/or type of their planned actions on the basis of new sensory information. In the present experiments, participants planned to make a right index finger keypress 3 s after a warning stimulus but on some trials were interrupted by a temporally unpredictable auditory tone prompting the same action (experiment 1) or a different action (experiment 2). In experiment 1, by comparing the reaction time (RT) to tones presented at different stages of the preparatory period to RT in a simple reaction time condition, we determined the cost of switching from an internally generated mode of response production to an externally triggered mode in situations requiring only a change in when an action is made (i.e., when the tone prompts the action at a different time from the intended time of action). Results showed that the cost occurred for interruption tones delivered 200 ms after a warning stimulus and remained relatively stable throughout most of the preparatory period with a reduction in the magnitude of the cost during the last 200 ms prior to the intended time of movement. In experiment 2, which included conditions requiring a change in both when and what action is produced on the tone, results show a larger cost when the switched to action is different from the action being prepared. We discuss our results in the light of neurophysiological experiments on motor preparation and suggest that intending to act is accompanied by a general inhibitory mechanism preventing premature motor output and a specific excitatory process pertaining to the intended movement. Interactions between these two mechanisms could account for our behavioral results. |
| | |
Authors:
|
Sukhvinder S Obhi; Shannon Matkovich; Robert Chen |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-08-26 |
Journal Detail:
|
Title: Journal of neurophysiology Volume: 102 ISSN: 1522-1598 ISO Abbreviation: J. Neurophysiol. Publication Date: 2009 Nov |
Date Detail:
|
Created Date: 2009-11-05 Completed Date: 2010-01-25 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: United States |
Other Details:
|
Languages: eng Pagination: 2755-62 Citation Subset: IM |
Affiliation:
|
Centre for Cognitive Neuroscience and Wilfrid Laurier University, Waterloo, Ontario, Canada. sobhi@wlu.ca |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Acoustic Stimulation
/
methods Adult Attention / physiology Cognition / physiology* Female Fingers / physiology Humans Intention* Judgment / physiology Male Movement / physiology* Psychomotor Performance / physiology* Reaction Time / physiology Time Factors Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: A question of reference frames: Visual direction-selective neurons in the accessory optic system of ...
Next Document: FUNCTIONAL ASYMMETRIES REVEALED IN VISUALLY GUIDED SACCADES: AN FMRI STUDY.