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- Title
The mind's eye, looking inward? In search of executive control in internal attention shifting.
- Authors
Gehring, William J.; Bryck, Richard L.; Jonides, John; Albin, Roger L.; Badre, David
- Abstract
Abstract In studies of mental counting, participants are faster to increment a count that was just incremented (no-switch trial) than to increment a different count (switch trial). Investigators have attributed the effect to a shift in the internal focus of attention on switch trials. Here we report evidence for other bottom-up and top-down contributions. Two stimuli were mapped to each of two counts. The no-switch facilitation was greater when stimuli repeated than when they were different. Event-related potential (ERP) activity associated with repetitions was anterior to that associated with switching. Runs of no-switch trials elicited faster responses and frontal ERP activity. Runs of switches and large counts both elicited slow responses and reduced P300 amplitudes. Bottom-up processes may include priming on no-switch trials and conflict on switch trials. Top-down processes may control conflict, subvocal rehearsal, and the contents of working memory.
- Subjects
COGNITION; EVOKED potentials (Electrophysiology); ELECTROPHYSIOLOGY; SHORT-term memory; MEMORY
- Publication
Psychophysiology, 2003, Vol 40, Issue 4, p572
- ISSN
0048-5772
- Publication type
Article
- DOI
10.1111/1469-8986.00059