FUNCTIONAL SEPARATION OF GLOBAL AND LOCAL STEREOPSIS INVESTIGATED BY CROSS-ADAPTATION

Reports that brain lesions may differentially affect global and local stereopsis suggest that anatomically separate mechanisms underlie thes e two functions. We demonstrate here that adaptation to global stereog rams induces an after-effect on local stereopsis as well as on global stereopsis, showing that the two mechanisms cannot be entirely separat e. We suggest that global stereopsis depends upon an interaction betwe en primary visual area V1 and higher brain areas such as inferotempora l cortex.