Search PubMed⌕ Search

Biomedical subjects

G G Mascetti

Publications and source records attributed to G G Mascetti.

26 records · Page 2Linked to original sources
PubMed1978

Effects of lesions of areas 17, 18 and 19 on interocular transfer of pattern discriminations in split-chiasm cats.

Split-chiasm cats with unilateral or bilateral lesions largely removing the commissurally connected portions of visual cortical areas 17, 18 and 19 showed good interocular transfer of monocularly learned pattern discriminations. The capacity for interocular transfer in these cats was in fact little or not different from that of split-chiasm cats with an intact cortex. Split-chiasm cats with an additional section of the forebrain commissures, as well as two split-chiasm cats with 17-18 lesions also submitted to forebrain commissurotomy after having shown good interocular transfer, were generally incapable of transferring pattern discriminations between the eyes. It is concluded that interocular transfer of pattern discriminations, in split-chiasm cats does not require areas 17, 18 and 19 and must therefore depend on other cortical areas.

Animals↗
PubMed1978

Effects of experience on interocular transfer of pattern discriminations in split-chiasm and split-brain cats.

Interocular transfer of monocularly learned pattern discriminations was found to be imperfect in split-chiasm cats but to improve as a result of specific practice with interocular transfer tasks. Section of the forebrain commissures subsequently performed in these animals abolished immediate interocular transfer of pattern discriminations. However, there were some savings in reattaining the learning criterion with the second eye. Other cats that learned the same discriminations monocularly but had sustained a combined section of optic chiasm and forebrain commissures before learning showed no indication of interocular transfer. These data suggest that the commissural systems involved in interocular and interhemispheric transfer of pattern discriminations may be modified by practice and learning. Further, it is possible that the intervening transfer experience between the section of the optic chiasm and that of the forebrain commissures results in the persistence of some capacity for interocular transfer of pattern discriminations after commissurotomy. However, this residual capacity may be negligible when compared with the capacity for interocular transfer of split-chiasm cats with intact forebrain commissures.

Animals↗