Aftereffects and the representation of stereoscopic surfaces

B Lee

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The structure of human disparity representation is examined through (i) adaptation experiments and (ii) model simulations of the data. Section 3 presents results of adaptation experiments designed to illuminate the structure of human disparity representation. Section 4 presents model simulations of three different disparity representation schemes. In the experiments, participants adapted to a 0.133 cycle deg(-1) sinusoidally corrugated surface with 10 min of are peak-to-trough disparity. A flat test surface was briefly presented, in which the aftereffect surface was perceived. Adapt and test surfaces were placed on disparity pedestals and thus presented in front of or behind the plane of fixation. The adapt surface could be offset from the fixation plane by +/-8 to 24 min of are. The test surface could be offset from the fixation plane by +/-8 to 48 min of are. The depth aftereffect was measured in different disparity planes by a nulling method and 'topping-up' procedure. After effect tuning functions were obtained whose bandwidths, magnitudes, and tuning depended on the disparity planes of both the adapt and test surfaces. These parameters were used to constrain the models tested in section 4. On the basis of the two studies, it is argued that the human stereoscopic system encodes spatial changes of disparity using channels localised within disparity planes. A localised disparity-gradient model of the human representation of disparity is proposed.

Original languageEnglish
Pages (from-to)1155-1169
Number of pages15
JournalPerception
Volume28
Issue number9
Publication statusPublished - 1999

Keywords / Materials (for Non-textual outputs)

  • DISPARITY
  • DEPTH
  • PERCEPTION
  • CHANNELS

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