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DRST spatial span differences across age. A) Linear relationship between age and DRST spatial span for all monkeys (solid line; p = 0.00034, n = 70) and monkeys with electrophysiological recordings (dashed line and square symbols; p = 0.024, n = 18). B) Mean ± SEM DRST spatial span in young, middle-aged and aged monkeys. See Table 3 for effect size and statistical significance of post hoc comparisons. ***p = 0.0008
