Neuronal Coding by Cortical Cells of the Frequency of Oscillating Peripheral Stimuli

Science  06 Dec 1968:
Vol. 162, Issue 3858, pp. 1130-1132
DOI: 10.1126/science.162.3858.1130


One class of neurons in the somatic sensory cortex of unanesthetized monkeys is rhythmically entrained by sinusoidal mechanical stimulation of the skin of the hand at low frequencies. A second class, which is linked to Pacinian afferents, increases its rate of discharge in response to high-frequency peripheral stimuli but is not entrained. The vibratory sense is served by two distinct classes of cortical cells. The code for the group sensitive to low-frequency stimuli is the temporal order of impulses; for the high-frequency group the code is the labeled line.