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How Do You Know When You Give Up?
When we exposed our subjects to more digits than they could remember, their pupils stopped dilatng or actually shrank. Add one with four digits caused a larger dilation than the task of holding seven digits for immediate recall. The pupil data corresponded precisely to subjective experience. Longer strings reliably caused larger dilations and ransformation task compounded the effort. And the peak of pupil size coincided with maximum effort.