 In conditions of microstimulation relative to its absence, the monkey was more likely to report that there was motion in the stimulated neuron’s preferred direction. In the original experiment, the psychophysical effect of microstimulation was equivalent to the addition of 7-20% coherence in the stimulus with respect to the neuron’s preferred direction, depending on the experimental conditions. Further, as a test of necessity, a selective lesion of MT disrupted motion discrimination though the animals were able to recover some function suggesting that other visual information streams could be tapped so as to support performance (Newsome &amp; Paré 1988).