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J Neurophysiol (March 1, 2003). 10.1152/jn.00661.2002
Submitted on Submitted 12 August 2002; accepted in final form 17 November 2002
1Istituto di Fisiologia Umana, 3Dipartimento di Psicologia, Università di Parma, 43100 Parma, Italy; 2Institute of Applied and Computational Mathematics, Foundation for Research and Technology Hellas, 71110 Heraklion, Crete, Greece; and 4Dipartimento Scienze Biomediche e Terapie Avanzate, Sez. di Fisiologia Umana, Università degli Studi di Ferrara, 44100 Ferrara, Italy
Raos, Vassilis,
Gianfranco Franchi,
Vittorio Gallese, and
Leonardo Fogassi.
Somatotopic Organization of the Lateral Part of Area F2 (Dorsal
Premotor Cortex) of the Macaque Monkey. J. Neurophysiol. 89: 1503-1518, 2003. The somatotopy of the
lateral part of dorsal premotor area F2 has been studied by means of
intracortical microstimulation and single neuron recording. The results
show that most of this sector of F2 is excitable with low-intensity
currents (3-40 µA) and that intracortical microstimulation evokes
forelimb and trunk movements. Both proximal and distal forelimb
movements are evoked in similar percentages. The proximal and distal
forelimb representations partially overlap. However, proximal movements
tend to be located more medially (laterally to the superior precentral
dimple), whereas distal movements tend to be located more laterally
(medially to the spur of the arcuate sulcus). The somatotopic
organization demonstrated with microstimulation is confirmed by the
similar somatotopic organization of active movements and of
somatosensory properties revealed by single-neuron recording. The
excitability and somatotopic organization of the lateral part of area
F2 are discussed in relation to previous electrophysiological and
anatomical findings. The involvement of the distal forelimb
representation of area F2 in programming and controlling reaching to
grasp movements is suggested.
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