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Pupillary response characteristics in response to no-tone (N, black), distractor (D, orange), and target (T, green) trials in younger, middle aged, and older adults. a Area under the curve (AUC), b maximum pupil diameter, c latency to maximum pupil diameter, d maximum positive rate of change, and e maximum negative rate of change. AUC data has been normalized by dynamic range; latency to maximum does not depend on normalization method. Plots show mean and standard error of the mean
