The statistical efficiency for detecting sinusoidal modulation of average dot density in random figures
article
The average density of randomly placed dots was modulated according to a spatial sinusoid and estimates were made of the signal/noise ratio (d′) of the sensory representation of the pattern from subjects responses. This was compared with the signal/noise ratio of the targets and the results are expressed as the efficiency (F) with which the statistical information in the targets is utilized. For single-barred gratingsF can reach 50% and it decreases as the number of bars increases. For many-barred gratingsd′ is an accelerating function of modulation depth. These results can be partly interpreted in terms of a model using “and” and “or” operations to match the image with a caricature of the expected pattern that the subject holds in his mind.
TNO Identifier
5397
Source
Vision Research, 21(6), pp. 765-777.
Pages
765-777
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