Information Storage in Nerve Cells 



193 



B 



Fig. 3. Patterns of response in single units to an acoustic stimulus. Duration of 

 the tone of 200 cycles per second is indicated by the two upward deflections in 

 the second channel of the oscilloscope. Before polarization (A) there was no 

 effect on the discharge frequency of a unit in motor cortex. During polarization 

 responses to sound appeared either in the form of a single high frequency burst (B), 

 a sudden cessation of firing (C), or high-frequency bursts at the "on" and at 

 the "oflf" of the tone (D). Calibration: 5 millivolts and one second (40). 



