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J Neurophysiol 89: 1503-1518, 2003; doi:10.1152/jn.00661.2002
0022-3077/03 $5.00
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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

Somatotopic Organization of the Lateral Part of Area F2 (Dorsal Premotor Cortex) of the Macaque Monkey

Vassilis Raos,1,2 Gianfranco Franchi,1,4 Vittorio Gallese,1 and Leonardo Fogassi1,3

 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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