The Threshold Signal:Noise Ratio in the Perception of Fragmented Figures |
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Authors: | A V Merkul'ev S V Pronin L A Semenov N Foreman V N Chikhman Yu E Shelepin |
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Institution: | (1) I. P. Pavlov Institute of Physiology, 6 Makarov Bank, 199034 St. Petersburg, Russia;(2) Middlesex University, Enfield, London, UK |
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Abstract: | Perception thresholds were measured for fragmented outline figures (the Gollin test). A new approach to the question of the
perception of incomplete images was developed. In this approach, figure fragmentation consisted of masking with multiplicative
texture-like noise — this interference was termed “invisible” masking. The first series of studies established that the “similarity”
between the amplitude-frequency spectra of test figures and “invisible” masks, expressed as a linear correlation coefficient,
had significant effects on the recognition thresholds of these figures. The second series of experiments showed that progressing
formation of the figures was accompanied by increases in the correlation between their spatial-frequency characteristics and
the corresponding characteristics of the incomplete figure, while the correlation with the “invisible” mask decreased. It
is suggested that the ratio of the correlation coefficients, characterizing the “similarity” of the fragmented figure with
the intact figure and the “invisible” mask, corresponds to the signal:noise ratio. The psychophysical recognition threshold
for figures for naive subjects not familiar with the test image alphabet was reached after the particular level of fragmentation
at which this ratio was unity.
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Translated from Rossiiskii Fiziologicheskii Zhurnal imeni I. M. Sechenova, Vol. 90, No. 11, pp. 1348–1355, November, 2004. |
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Keywords: | outline figures fragmentation recognition threshold signal:noise |
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