1.
Arq Bras Cardiol
; 85 Suppl 3: 49-94; 1-48, 2005 Sep.
Article
in English, Portuguese
| MEDLINE
| ID: mdl-16211166
2.
Arq. bras. cardiol
; 85(supl.3): 1-48, set. 2005. tab
Article
in Portuguese
| LILACS
| ID: lil-414357
3.
Neuroreport
; 13(16): 2001-4, 2002 Nov 15.
Article
in English
| MEDLINE
| ID: mdl-12438914
ABSTRACT
To investigate whether contour integration is a generalized mammalian feature we studied single cells in V1 on the South-America opossum ( ), a plesiomorphic animal believed to retain basic characteristics of early mammals. We observed that when a cell's receptive field (RF) was masked (i.e. an artificial scotoma was produced), sweeping a long bar (several times the length of the RF) at the cell's preferred orientation elicited robust responses in many cells (28/103, or 27%). Therefore, some cells in the primary visual cortex of the opossum interpolate under conditions consistent with physical occlusion. The present results indicate that the property of contour integration appears to be a basic property of the mammalian visual system.