A few findings from our laboratory are provided as evidence favoring "isomr
phism" in filling-in. One is the responsivity of macaque-cortical area V1 c
ells to a stimulus designed for surface filling-in at the blind spot. Anoth
er is a phenomenological observation of motion aftereffect confined within
a filled-in surface at the blind spot. Our recent study on the monkey's per
ception of surface filling-in at a scotoma is also mentioned.