Information Processing in the Time Domain 



337 



SPECTRAL ANALYSIS 



BPINEPHRINE EFFECT 



Fig. 5. Histogi am-like Display Resulting from ''Band Breakdown'' of Square Wave 

 Trains. Small downward spikes indicate ten second epochs. The upward spikes 

 are proportional in their amplitude to the percentage time occupied in tlie 

 previous ten seconds by square waves which fell into a particular band (see 



Table I). 



approximate the frequency breakdown employed in clinical electro- 

 encephalography. Major period band 1 covers delta activity, band 

 2 is a "slow" theta, band 3 is a "fast" theta, etc. Minor period is 

 distributed as ten cycle increments in each of the ten bands. 



The histogram-like display resulting from this band breakdown 

 process, which we call spectral analysis, is illustrated in Figure 5. 

 In both traces the small downward spikes are ten second epoch 

 markers. The upward spikes are proportional in their amplitude 



