Binocular inhibition: Psychophysical and electrophysiological evidence

Shahina Pardhan, Jim Gilchrist, William Douthwaite, Keng Hung Maurice Yap

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)


Binocular summation, defined as an increase in the binocular response compared with the monocular, occurs when the sensitivities of the two eyes are equal. We investigated the psychophysical and electrophysiological binocular response to a difference in monocular retinal illuminance. Different levels of unequal monocular sensitivities were induced by means of neutral density filters placed in front of one eye. Both studies produced similar results. In the absence of filters, maximum binocular summation was produced. With increasing difference in monocular illuminance, the binocular response decreased steadily until it reached a level below the monocular. The clinical implications of binocular inhibition, a perceptual phenomenon similar to Fechner’s Paradox, are discussed.
Original languageEnglish
Pages (from-to)688-691
Number of pages4
JournalOptometry and Vision Science
Issue number9
Publication statusPublished - 1 Jan 1990


  • Binocular inhibition
  • Binocular summation
  • Contrast detection
  • Visual evoked response

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry


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