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Keywords:

  • Illusions;
  • Systematization;
  • Visual prediction;
  • Extrapolation;
  • Sensorimotor contingencies;
  • Compensation;
  • Neural delay;
  • Perceiving the present

Abstract

Mark Changizi et al. (2008) claim that it is possible systematically to organize more than 50 kinds of illusions in a 7 × 4 matrix of 28 classes. This systematization, they further maintain, can be explained by the operation of a single visual processing latency correction mechanism that they call “perceiving the present” (PTP). This brief report raises some concerns about the way a number of illusions are classified by the proposed systematization. It also poses two general problems—one empirical and one conceptual—for the PTP approach.