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Summary: Anais da Academia Brasileira de Ciências (2002) 74(3): 463-476
(Annals of the Brazilian Academy of Sciences)
ISSN 0001-3765
www.scielo.br/aabc
Two-dimensional map of direction selectivity in
cortical visual area MT of Cebus monkey*
ANTONIA CINIRA M. DIOGO1, JULIANA G.M. SOARES1,
THOMAS D. ALBRIGHT2 and RICARDO GATTASS1
1Instituto de Biofísica Carlos Chagas Filho, UFRJ, 21941-900 Rio de Janeiro, RJ, Brazil
2Salk Institute, #10010 N. Torrey Pines Rd., La Jolia, California, 92037-1099, USA
Manuscript received on June 24, 2002; accepted for publication on July 1, 2002;
contributed by Ricardo Gattass**
ABSTRACT
We studied the spatial organization of direction of motion in visual area MT of the Cebus apella monkey.
We used arrays of 6 (700 µm apart) parallel electrodes in penetrations tangential to the cortical layers to
record multi-unit responses to moving bars, at 200 µm steps. We determined the direction selectivity at
each recording site. The data from single penetrations showed cyclic and gradual changes in the direction
selectivity of clusters of cells, intermixed with abrupt 180 discontinuities along the electrode track. In
order to obtain maps of direction of motion selectivity, we examined the spatial distribution of direction of
motion in MT and we applied a method to determine the location of the centers of radial arrangements of
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