Jan Van Santen, George Sperling

Research output: Contribution to journalArticle

671 Scopus citations


The elaborated Reichardt detector (ERD) is an opponent system of two mirror-image subunits. Each submit receives inputs from two spatiotemporal filters (receptive fields), multiplies the filter outputs, and temporally integrates the product. Subunit outputs are algebraically subtracted to yield ERD output. ERD's can correctly indicate direction of motion of drifting sine waves of any spatial and temporal frequency. It is proved that with a careful choice of either temporal or spatial filters, the submits can themselves become quite similar or equivalent to the whole ERD. It is demonstrated that a system containing ERD's of various sizes can solve the correspondence problem in two-frame motion of random-bar stimuli and shows that the predicted phase dependencies when confronted with displays composed of triple sinusoids combined either in amplitude modulation phase or in quasi-frequency modulation phase. Finally, it is shown that, while the ERD may in some instances give larger responses to nonrigid than to rigid displacements, the subunits (and hence the ERD) are especially well behaved with continuous movement of rigid or smoothly deforming objects.

Original languageEnglish (US)
Pages (from-to)300-321
Number of pages22
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number2
Publication statusPublished - Feb 1985
Externally publishedYes


ASJC Scopus subject areas

  • Engineering(all)
  • Medicine(all)

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