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‘Dipper function’ within, but not between, cues for depth and lateral motion

‘Dipper function’ within, but not between, cues for depth and lateral motion. Andrew Glennerster, Rob Campbell and Andrew Parker University Laboratory of Physiology, Oxford. Left eye. Right eye. Lateral motion is easier to detect than motion in depth (Tyler 1971). Left eye. Right eye.

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‘Dipper function’ within, but not between, cues for depth and lateral motion

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  1. ‘Dipper function’ within, but not between, cues for depth and lateral motion Andrew Glennerster, Rob Campbell and Andrew Parker University Laboratory of Physiology, Oxford

  2. Left eye Right eye Lateral motion is easier to detect than motion in depth (Tyler 1971)

  3. Left eye Right eye Lateral motion is easier to detect than motion in depth (Tyler 1971)

  4. 10 Depth } Lateral Depth } Tyler (71) H & W (95) Lateral 1 Threshold amplitude (arcmin) 0.1 0.01 100 0 0.1 1 10 Pedestal amplitude (arcmin) Tyler (1971) and Harris and Watamaniuk (1995)

  5. Interval #1 e.g.: Interval #2 signal } lateral pedestal lateral pedestal + D depth Task: “which interval contained the signal?”

  6. Experimental details • Spatial • reference separation 30 arcmin • bar height 40’, width 2’ • pixel size 0.45’ @ 2.65m • anti-aliased • Temporal • target bar oscillated sinusoidally • 3 Hz • each interval 1 s • Psychophysics • 2-interval forced choice • one signal amplitude per block • at least 250 trials per point • threshold: amplitude for d’ = 1 • Apparatus • Wheatstone stereoscope

  7. 10 1 0.1 0.01 0 0.1 1 10 Detect Dlat on lateral pedestal Pedestal Ped +Dlat Threshold amplitude (arcmin) RAAC Pedestal amplitude (arcmin)

  8. 10 Pedestal 1 Ped +Ddep Threshold amplitude (arcmin) 0.1 RAAC 0.01 0 0.1 1 10 Pedestal amplitude (arcmin) Detect Ddepth on depth pedestal

  9. 10 Depth } Lateral Depth } Tyler (71) H & W (95) Lateral 1 Threshold amplitude (arcmin) 0.1 RAAC 0.01 100 0 0.1 1 10 Pedestal amplitude (arcmin) Tyler (1971) and Harris and Watamanuik (1995)

  10. Normalised thresholds and pedestals 10 Dlat on lateral ped Ddep on depth ped Normalised threshold amplitude 100 10 RAAC 0.1 Pedestal amplitude normalised by threshold of pedestal

  11. 10 1 0.1 0.01 0 0.1 1 10 Detect Ddepth on lateral pedestal Pedestal Ped+Ddep Threshold amplitude (arcmin) RAAC Pedestal amplitude (arcmin)

  12. 10 1 0.1 0.01 0 0.1 1 10 Detect Dlat on depth pedestal Pedestal Ped +Dlat Threshold amplitude (arcmin) RAAC Pedestal amplitude (arcmin)

  13. Ddep on lat ped Dlat on dep ped 10 1 0.1 0.01 0 0 0.1 0.1 1 1 10 10 Two subjects Dlat on lat ped Ddep on dep ped Threshold amplitude (arcmin) RAAC JH Pedestal amplitude (arcmin)

  14. Conclusion • A ‘dipper function’ within one domain • (Ddepth with depth pedestal or Dlat with lateral pedestal) • In this case, pedestal and target are processed by the same mechanisms • No ‘dipper function’ for Ddepth with lateral pedestal (and only a small one for Dlat with depth pedestal) • This suggests a lack of interaction between the processing of the two types of motion

  15. Dlat on depth ped Normalised thresholds and pedestals 10 Ddep on lateral ped Threshold amplitude (norm. by unmasked threshold) 100 10 RAAC 0.1 Pedestal amplitude (normalised by threshold for pedestal cue)

  16. Dlat ondepthped norm. by lat thresh Dlat on lat ped Normalised thresholds and pedestals 10 Ddep onlateralped Threshold amplitude (norm. by unmasked threshold) 100 10 RAAC 0.1 Pedestal amplitude (normalised by threshold for pedestal cue)

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