In the ventral half, the RFs shifted to more peripheral visual fields, and neurons with RFs in the lower visual field and those with RFs in the upper visual field were clearly segregated in the anterior and posterior parts, respectively.
In the ventral half, the RFs were larger, and their centers were shifted out of the fovea, so that these neurons represented more peripheral visual fields.
For instance, a radial gradient of load-induced amplitude suppression [1] could shift weighting within a voxel to units with larger and more peripheral receptive fields causing pRF changes similar to those we observed (c.f. Supplemental Results for a detailed discussion and control analyses addressing this possibility).
However, the effect waned in the more peripheral visual field representations of area 17 (−17.3 ± 7.3%; n = 5; not significant [n.s.]) and area 18 (−14.4 ± 3.7%; n = 5; n.s).s
Inhibition of return (IOR) as an indicator of attentional control is characterized by an eccentricity effect, that is, the more peripheral visual field shows a stronger IOR magnitude relative to the perifoveal visual field.
Therefore, little is known about IOR in the more peripheral visual field.
In the PIT, most neurons in the dorsal half of the recording sites had relatively small RFs enclosing the foveal center, whereas in the ventral half, RF centers shifted out of the fovea and represented a more peripheral visual field.
The mammalian receptive field is more complex, the more peripheral part of the field giving the opposite type of response to that given by the centre.
Furthermore, because the central field is represented in all three isopters, unlike the periphery which is covered by fewer isopters, this method should weight the central field more than the peripheral field.
It has been well established that the more peripheral regions of the visual field show a stronger projection to the superior colliculus of the midbrain and from there to extrastriate regions, compared to the foveal and perifoveal regions which possess a strong geniculo-striate projection.
