CENTRAL PERFORMANCE DROP BY NON-TEMPORAL MASKING

  • Satoru Kawamura

Abstract

Central performance drop (CPD) refers to the phenomenon that, in some conditions, texture segmentation is inferior in near fovea compared with that in peripheral area. It is controversial whether temporal backward masking is necessary for CPD to occur or not. This study proposes that CPD could occur without temporal masking. The texture was a set of oblique lines distributed on the screen. The target area was defined by the direction of the lines which were orthogonal to the lines of the non-target area. The texture was masked by the oblique lines, each of which intersected orthogonally the lines of the texture and were less bright than the lines of the texture. The subjects were requested to identify the location of the target area. As a result, the rate of correct identification decreased when the target area was farther from the fixation point of view.

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