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2 results

  • 6 - Current Perspectives on Primate Perception

  • Edited by Bennett L. Schwartz, Florida International University, Michael J. Beran, Georgia State University
  • Book:
    Primate Cognitive Studies
    Published online:
    28 July 2022
    Print publication:
    11 August 2022, pp 115-134

  • Summary

    This chapter reviews current topics within the subfield of perception with an emphasis on nonhuman primates. We review the psychophysical approach to the study of perception and misperception, including its application to the study of visual illusions and perceptual completion. Geometric illusions emerge when a target stimulus is embedded in an illusory-inducing context and include size illusions such as the Ebbinghaus–Titchener and Delboeuf illusions as well as line-length illusions such as the Ponzo illusion and Müller–Lyer illusion. We review differential perception of these illusions by primates and other species to understand better the role of perceptual processing mode and experimental design in the emergence of illusory experiences. Additionally, perceptual completion has contributed to our knowledge of the mechanisms underlying primate perception and includes studies on amodal completion and illusory contours. Current topics concerning these areas of research are emphasized, such as grouping mechanisms and other mechanisms of perceptual processing.

  • The influence of illusory motion on line bisection performance in normal subjects

  • KYUNG MOOK CHOI, BON D. KU, YONG JEONG, BYUNG HWA LEE, HYUN-JUNG AHN, SUE J. KANG, JUHEE CHIN, KENNETH M. HEILMAN, DUK L. NA
  • Journal:
    Journal of the International Neuropsychological Society / Volume 11 / Issue 7 / November 2005
    Published online by Cambridge University Press:
    16 December 2005, pp. 881-888

  • The present study examines whether illusory movement (IM) of a horizontal line, induced by a moving background (MB), influences line-bisection performance in normal subjects. The first experiment attempted to identify the speeds of MB that induce IM. We found that when speed is increased from 1.53° to 13.3°/sec, IM increases, but that with further speed increases, IM decreases. Leftward MB induces rightward IM, and vice versa. In the second experiment, we had subjects bisect lines at MB speeds that had been shown to induce IM in the first experiment. We found that leftward MB induced a rightward bias, and vice versa. We also found that there was a relationship between the magnitude of IM and the degree of bias. In the third experiment, by making the target line larger than the MB, we made the conditions where IM was presumably absent. Unlike the results of bisection performed with IM, subjects showed a bias in the direction of the MB. Overall, these experiments demonstrated that the perception of motion induces subjects to attend in the direction of movement. (JINS, 2005, 11, 881–888.)