Is left inferior frontal gyrus a general mechanism for selection?
Converging lines of research in neuroimaging recognize selection as one of the critical functions of prefrontal cortex (e.g., see Annu. Rev. Neurosci. 24, 2001 167). We examined a central thesis of a selection hypothesis (Neuropsychologia 41, 2003 280) that the left inferior frontal gyrus (LIFG) serves as a general mechanism for selecting among competing representations (Annu. Rev. Neurosci. 18, 1995 193). Participants were presented with two sets of letters to remember and then cued to select one set from the two as the target set for subsequent recognition. LIFG showed significantly more activation when the cue elicited a strong need for selection, relative to when it did not, suggesting that the involvement of this area in selection is generalizable beyond semantic retrieval tasks as originally found. This result provides supporting evidence for the selection hypothesis.
Department of Linguistics, Joint Laboratory for Language and Cognitive Neuroscience, University of Hong Kong, Hong Kong. jxzhang@hku.hk
John X
JX
Zhang
Ching-Mei
CM
Feng
Peter T
PT
Fox
Jia-Hong
JH
Gao
Li Hai
LH
Tan
D000328:Adult; D003116:Color; D003463:Cues; D005260:Female; D005625:Frontal Lobe / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011932:Reading; D014796:Visual Perception / Q000502:physiology*