Prefrontal brain magnetic activity: effects of memory task demands.
Changes in spatiotemporal profiles of brain magnetic activity were investigated in healthy volunteers as a function of varying demands for phonological storage of spoken pseudowords. Greater activity for the phonological memory task was restricted to the dorsolateral prefrontal cortex (DLPFC) in the left hemisphere. During performance of the memory task, activity was initially found in the left superior temporal gyrus (between 100 and 200 ms), followed by activity in the ventrolateral prefrontal, motor, and premotor cortices (between 200 and 300 ms). Activity in DLPFCs was first observed consistently across participants later, between 300 and 400 ms. The data are consistent with the purported role of posterior temporal cortices in phonological analysis and in the online storage of phonological information, the contribution of ventrolateral and motor processing areas in establishment and short-term maintenance of articulatory representations through rehearsal, and the role of DLPFCs in the executive control of the maintenance operation.
Maestú
Fernando
F
0000-0002-3195-0071
Centro de Magnetoencefalografia Dr Pérez Modrego, Universidad Complutense Madrid.
Campo
Pablo
P
0000-0003-4539-6857
Centro de Magnetoencefalografia Dr Pérez Modrego, Universidad Complutense Madrid.
Capilla
Almudena
A
0000-0002-4181-4284
Centro de Magnetoencefalografia Dr Pérez Modrego, Universidad Complutense Madrid.
Simos
Panagiotis G
PG
0000-0002-0116-8564
Department of Neurosurgery, Vivian L. Smith Center for Neurologic Research, University of Texas-Houston Medical School.
Paúl
Nuria
N
Unidad de Daño Cerebral, Hospital Beata María Ana de Jesús.
Fernandez
Santiago
S
Departamento de Psicologia, Universidad Camilo José Cela.
Fernández
Alberto
A
0000-0001-9998-8343
Centro de Magnetoencefalografia Dr Pérez Modrego, Universidad Complutense Madrid.
Amo
Carlos
C
Centro de Magnetoencefalografia Dr Pérez Modrego, Universidad Complutense Madrid.
González-Marqués
Javier
J
Departamento Psicología Básica II, Universidad Complutense Madrid.
Ortiz
Tomás
T
Centro de Magnetoencefalografia Dr Pérez Modrego, Universidad Complutense Madrid.
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D000704:Analysis of Variance; D001931:Brain Mapping; D004558:Electric Stimulation; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008280:Magnetics; D015225:Magnetoencephalography / Q000379:methods; D008297:Male; D008568:Memory / Q000502:physiology*; D009483:Neuropsychological Tests; D010700:Phonetics; D017397:Prefrontal Cortex / Q000502:physiology*; D017603:Signal Detection, Psychological / Q000502:physiology; D013997:Time Factors; D014706:Verbal Learning / Q000502:physiology*