Abstract
Pupillary reactions were continuously photographed while Ss attempted to generate images suggested by stimulus words. The nouns represented three levels of task difficulty in terms of the rated ease with which the words evoke sensory images. Ss were required to press a key when an image occurred as well as subsequently describe the image. The results showed a significant increase in pupil size during the imagery task, but differential amounts of dilation were not exactly related to the three levels of task difficulty, whereas the time to maximum dilation was, suggesting that latency of dilation is a more sensitive index of difficulty in the imagery task.
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