![]() ![]() Performance in the two situations differed and, on zero-peck trials, a bias towards the “small” choice was found. It has been suggested that the end result of a delay may be similar to presenting no sample to begin with, so we compared preferences following a delay and following trials where no pecks were required. ![]() On average, delayed choices reflected indifference between the choices, but individual analyses showed different biases, replicating previous findings. Subsequently, accuracy was tested in delayed matching, with the delay spent in darkness, contrarily to previous studies, that used illuminated delays. In a symbolic matching-to-sample task, pigeons learned to discriminate between 5 and 15 key pecks (samples): different choices were correct following the smaller and the larger response requirements. ![]()
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