Artificial Blindness and Filling-In : Filling-In after Apparent Motion Induced by MIB

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  • Artificial Blindness and Filling-In — Filling-In after Apparent Motion Induced by MIB —

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We investigated the filling-in (FI) of line segments at the Artificial Scotoma (AS) created by Motion Induced Blindness (MIB). The FI sensations for line segments were fairly similar to that of the natural Blind Spots (BS), though the geometrical configurations and luminance conditions on stimuli were substantially limited. The 2.5 degree thick black line segment was filled in after 6.5 degree diameter disk was disappeared by MIB. The thin lines, however, didn't fill in. We also obtained the pro and con evidences for the historical FI theory. The disappearance of the uniformly filled circles followed the general FI theory. On the other hand we found it controversial with the FI accounts that the concentric circles disappeared altogether. In the conventional MIB, the target figure disappears and re-appears in a stochastic and spontaneous manner. We devised the novel inducer for MIB so as to yield the synchronization of dis- and re-appearance of the targets with the motion of the inducers. The two stationary disks disappeared in an alternating manner by MIB effects. The subjects observed the background color after disappearance. The alternating disappearance of the two white disks provided the observers with the sensation of the Apparent Motion (AM) of the single disk which would be perceived as jumping up and down. The significant question was raised; did MIB precede AM? When the AM sensation was the case, the percept was not the disappearance but the motion of the single entity. The sensation of the motion provided the almost equivalent conditions to the motion stimuli over the natural BS. We summarized the issue whether the FI at AS by MIB was intrinsically equivalent to the phenomena on BS. The hierarchy of underlying mechanisms of AM and MIB was yet unknown, however, we rather proposed yet another high level motion perception mechanism.

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