Topic: retinogeniculate-cortical inputs

Callosal connections (CC) in early sensory areas are believed to act as conditional drivers because their impact depends on all other inputs reaching their contralateral targets for a given task. In the intact cat brain, CC to the 17/18-transition zone (TZ) act mainly as modulators, rarely as direct drivers, depending on both target and stimulus properties. Given that preferred spatial frequency (SF) gradually changes from area 17 towards 18 we suspected CC to reflect the ratio of x- and y- cell driven retinogeniculate-cortical inputs. We thus recorded monocular and binocular responses to diff