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Takako Yoshida, Ayumi Yamaguchi, Tenji Wak; Tactual search for change has less memory. Journal of Vision 2004;4(8):402. doi: https://doi.org/10.1167/4.8.402.
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© ARVO (1962-2015); The Authors (2016-present)
In some trans saccadic memory theories and active touch theories, the sensory integration process requires some memories. To directly assess the visuo-spatial working memory capacity involved in active touch, we executed “tactual search for change” (Rensink, 2000). The observer's task was to search for the tactually changing target. The set size (2–10 items) and the stimulus on-time (200–800msec) were manipulated. The reaction time increased linearly as the set size increased. The effect of the on-time was not statistically significant. The estimated number of the items held in the memory across a temporal display gap was below 1.0 in all on-time conditions. The same observer group showed 6.5 visual working memory capacity when they executed “visual search for change” task. Therefore our results can not be attributed to our observers' low memory capacity. Our results indicate that active touch requires longer on-time to establish stable representations, or tactile working memory is topographic, and once an observer moves his or her fingers elsewhere, the representations are gone.
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