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Third-party-funded project

Data processing times for binocular depth perception analyzed by the "Delayed Stereopsis Illusion" (DSI)

Project management at the University of Würzburg:

Participating scientists:

How long do we need to process disparity data for stereopsis? Viewed pseudoscopically, an opaque square floating above a random-dot pattern appears as a rectangular cut-out. When the surrounding pattern moves upwards, an illusory gap is seen at the upper edge of the square (DSI). Its width indicates the 3-D processing time needed to determine spatial depth of the pattern, which virtually appears ?from nowhere?.
Data were collected psychophysically with a mechanical apparatus and a computer-generated model system. We found interindividually differences ranging from 60 to 80 ms. In scotopic vision, 3-D processing times are prolonged to 160 - 180 ms, in accordance with the Pulfrich effect

Key words:
    Human stereopsis
    data processing time
    delayed perception
    Pulfrich effect
    binocular depth reversal
    visual illusion

Projekt period: from 01.1998 to 01.2002

Funding institution:
DFG ( WO 150/12-1 ) ,Granting date: 20.01.1998