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Response-specific sources of dual-task interference in human pre-motor cortex.
- Source :
-
Psychological research [Psychol Res] 2006 Nov; Vol. 70 (6), pp. 436-47. Date of Electronic Publication: 2005 Nov 11. - Publication Year :
- 2006
-
Abstract
- It is difficult to perform two tasks at the same time. Such performance limitations are exemplified by the psychological refractory period (PRP): when participants make distinct motor responses to two stimuli presented in rapid succession, the response to the second stimulus is increasingly slowed as the time interval between the two stimuli is decreased. This impairment is thought to reflect a central limitation in selecting the appropriate response to each stimulus, but not in perceptually encoding the stimuli. In the present study, it was sought to determine which brain regions are specifically involved in response selection under dual-task conditions by contrasting fMRI brain activity measured from a response selection manipulation that increased dual-task costs, with brain activity measured from an equally demanding manipulation that affected perceptual visibility. While a number of parieto-frontal areas involved in response selection were activated by both dual-task manipulations, the dorsal pre-motor cortex, and to a lesser extent the inferior frontal cortex, were specifically engaged by the response selection manipulation. These results suggest that the pre-motor cortex is an important neural locus of response selection limitation under dual-task situations.
- Subjects :
- Adult
Brain Mapping
Dominance, Cerebral physiology
Female
Frontal Lobe physiology
Functional Laterality physiology
Humans
Male
Nerve Net physiology
Oxygen blood
Parietal Lobe physiology
Attention physiology
Color Perception physiology
Image Processing, Computer-Assisted
Magnetic Resonance Imaging
Motor Cortex physiology
Pattern Recognition, Visual physiology
Psychomotor Performance physiology
Reaction Time physiology
Refractory Period, Psychological physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0340-0727
- Volume :
- 70
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Psychological research
- Publication Type :
- Academic Journal
- Accession number :
- 16283409
- Full Text :
- https://doi.org/10.1007/s00426-005-0022-6