Ding J, Levi D, 2011, "The spatial limits of recovered stereopsis in strabismic/amblyopic adults" Perception 40 ECVP Abstract Supplement, page 120
The spatial limits of recovered stereopsis in strabismic/amblyopic adults
J Ding, D Levi
We recently developed a perceptual learning procedure which enabled individuals who were stereoblind or stereoanomalous to recover their stereo perception [2010 Journal of Vision 10(7) 1124, doi:10.1167/10.7.1124). In the current study, we used bandpass noise (BN) to study the spatial limits of the recovered stereopsis. BN was produced by filtering a two-dimensional binary random noise with a 2D-isotropic bandpass filter whose central spatial frequency was 0.34∼21.76 cpd with a half-amplitude bandwidth of 1.26 octaves at each frequency. The spatial frequency response was measured for both normal observers and those with recovered stereopsis. We found that both stereo systems showed bandpass performance, but the frequency band for the recovered stereopsis was much narrower than that for the normal observers. The peak stereo performance occurred at 5.44 cpd for normal observers, but only at 1.36 cpd for those with recovered stereopsis, and was much less precise in recovered than in the normal stereopsis. We also measured the maximum disparity (Dmax for both stereo systems and we found that Dmax in the recovered stereopsis was smaller than normal. We conclude that the stereopsis recovered following perceptual learning is more limited than the normal visual system in the spatial frequency band and the perceived disparity range.
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