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Summation of rapid tactile stimuli in parietal lobe disease.
  1. R Tegnér


    The perception threshold for trains of rapid tactile pulses, applied to the index finger, has been measured in patients with parietal lobe lesions and in patients with median nerve lesions. The former patients had increased perception thresholds for single tactile pulses on the abnormal side. With successively prolonged pulse trains, the threshold decreased exponentially to reach a stable level after 150-400 ms. In contrast, the median nerve patients had increased perception thresholds for tactile pulses irrespective of pulse train duration.

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