Premium
Separation of phasic arousal and expectancy effects in a speeded reaction time task via fMRI
Author(s) -
Hackley Steven A.,
Langner Robert,
Rolke Bettina,
Erb Michael,
Grodd Wolfgang,
Ulrich Rolf
Publication year - 2009
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2008.00722.x
Subject(s) - psychology , expectancy theory , arousal , task (project management) , cognitive psychology , selective attention , developmental psychology , audiology , cognition , neuroscience , social psychology , medicine , management , economics
Abstract Sixteen neurologically normal volunteers performed a 2‐choice speeded reaction time (RT) task in which the imperative was the change in color of a clock hand. During trial blocks with low temporal uncertainty (good clock condition), this imperative stimulus occurred at a fixed location (e.g., 2:00). In the bad clock condition, the clock was unpredictive of imperative onset. On half of both good and bad clock trials, a task‐irrelevant, cutaneous accessory stimulus accompanied the imperative. The speeding of reactions by the accessory was associated with activation primarily in and near the supramarginal gyrus of the parietal lobe. Contrasts of good‐ versus bad‐clock conditions revealed activation in a variety of perceptual, motor, and executive control regions. Apart from interactions within the cerebellum and left anterior insula, there was little overlap between structures influenced by the arousal and expectancy manipulations.