nif:isString
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The probability that a change to an item represented in memory is correctly detected is therefore r+(d−2)(1−r)d−1+1−rd−1(1−rk−1)+1−rd−1rk−1t where r is the probability that the shape of an item represented in memory is correctly retrieved, d is the size of the set of possible item shapes, and t is the rate at which the observer reports change when he/she does not perceive a change to any of the items represented in memory.
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