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Cumulative distribution plots showing the suppression indices in more selective cells (OB ≥ 0.1) and broadly tuned cells (OB < 0.1) in young and old monkeys. The suppression index was calculated as the ratio of the maximal response of the CRFvar stimulus to the minimal response of the CRFopt-IRFvar stimulus. The x-axis is on a log (base 2) scale, and the dotted line indicates a suppression index of 3.
