Subjective randomness and natural scene statistics |
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Authors: | Anne S Hsu Thomas L Griffiths Ethan Schreiber |
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Institution: | University College London, London, England. |
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Abstract: | Accounts of subjective randomness suggest that people consider a stimulus random when they cannot detect any regularities
characterizing the structure of that stimulus. We explored the possibility that the regularities people detect are shaped
by the statistics of their natural environment. We did this by testing the hypothesis that people’s perception of randomness
in two-dimensional binary arrays (images with two levels of intensity) is inversely related to the probability with which
the array’s pattern would be encountered in nature. We estimated natural scene probabilities for small binary arrays by tabulating
the frequencies with which each pattern of cell values appears. We then conducted an experiment in which we collected human
randomness judgments. The results show an inverse relationship between people’s perceived randomness of an array pattern and
the probability of the pattern appearing in nature. |
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