Stochastic Properties of Segmentation-Rivalry Alternations.
K. F. Arrington
Perception, 1996; 25, Suppl. p. 62.
European Conference on Visual Perception (ECVP),
Strasbourg, France, 9-13th September 1996.
Abstract.
Segmentation rivalry is the alternation of perceived depth that occurs
when depth information from, e.g. occlusion and stereo disparity cues,
are inconsistent (Arrington & Held, 1995, Arvo Abstracts). It was
conjectured that the rivalry is based on reciprocal inhibition between
end-stopped cell populations that code the same spatial location but
opposite direction of surface segmentation in depth. Here the
stochastic properties of these depth alternations are analyzed and
compared to prior analysis (Blake, Fox, McIntyre, 1971, J. Exp. Psych.
88:3) of binocular rivalry alternations, which have suggested that
successive phase durations are approximated by a theoretical gamma
distribution: f(x)=b^a/Exp[LogGamma(a)]*x^(a-1)*Exp[-b*x]. Phenomenally
in-front (F) vs. phenomenally behind (B) phase durations during
segmentation rivalry were collected at 2' stereo disparity that
produces a maximal alternation rate and approx. 50% duty cycle. Least
square error fit to the two duration data sets was very good (F:
a=3.69, b=0.514; B: a=6.54, b=0.780) and the chi-square goodness-of-fit
showed insignificant (p .LE. 0.01) departures from the theoretical gamma
distribution when the histogram was smoothed and in some cases when
not smoothed.
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