Information Processing in the Time Domain 



343 



overlap value in the moderately coupled group of four people in 

 the same room in therapeutic group interaction. In an empirical 

 approach to the problem of moderate coupling, we have plotted 

 the total number of GSR's generated by a group against the 

 total number of overlaps for that group. Figure 8 is the scatter 

 diagram of two different groups in therapy. These data represent 

 approximately 50,000 GSR's. The rather good linear relationship 

 in a fair-sized population, with respect to number of subjects and 

 hours of interaction, suggests an expected value of GSR coinci- 

 dence which may be used as a baseline for the interpretation of 

 overlap between subjects for small increments of time. This tech- 

 nique may allow us to reconsider group process studies in terms 

 of this new approach. 



The final application of period analysis which we would like 

 to describe is its use in connection with the electrocardiogram 

 (EKG). Figure 9 summarizes some of the parameters, relationships 

 and cjuestions which are of interest to us in reduction of the EKG. 



D/iTA OBTAINABLE FROM PERIOD ANALYSIS 



m 



PRIMARY EKG 



^^ 



Q S 



f, FIRST DERIVATIVE 



ANALYSIS 

 OF 



PRESENT 

 MEASURES 



OTHER MEASURABLE 

 PARAMETERS 



QRS 



T 



PR INTERVAL 



PR SEGMENT 



QT INTERVAL 



ST SEGMENT 



ST INTERVAL 



FIRST 

 DERIVATIVE 



PR SEGMENT 



PR INTERVAL 



QRS 



ST SEGMENT 



SECOND 



DERIVATIVE PP" SEGMENT 



PR INTERVAL 



QRS 



ST SEGMENT 



PRIMARY a 



FIRST 

 DERIVATIVE 



RO-T INTERVAL 

 RO-U INTERVAL 

 P-RO SEGMENT 



a TIME DURATION OF 



ANY WAVE 

 bTIME DURATION OF 



ANY INTERVAL 

 ( ZERO CROSSING ) 

 c SIGNATURE 



RECOGNITION 



a TIME DURATION OF 



ANY WAVE 

 b TIME DURATION OF 



ANY INTERVAL 

 c SIGNATURE 

 RECOGNITION 



ANALYSIS QUESTIONS 



I. IS THE P WAVE INVERTED? 

 2 IS THE R WAVE INVERTED? 

 3,IS THE T WAVE INVERTED? 

 4 IS THE MAGNITUDE OF P,Q,' 



R.S.AND T GREATER THAN 



SOME CONSTANT? 

 5.Q = S? (TIME) 



1 IS THE RATE OF CHANGE 

 IN p Q.R.S.T, AND U WAVES 

 GREATER THAN SOME 

 CONSTANT? 



2 IS THE P WAVE SYMMETRICAL? 

 3. ARE CERTAIN WAVES 



INVERTED ? 



1 IS THE ACCELERATION OF P, 

 Q,R,S,T, AND U WAVES GREAT- 

 ER THAN SOME CONSTANT? 



2 HIGH FREQUENCY ACTIVITY? 



1 SYMMETRY OF T ? 



2 ARE THERE NOTCHES IN P,R, 

 AND T WAVES ? 



Fig. 9. Classical EKG Wave Shape and Derivatives. Parameters employed in clinical 



interpretation are related to other parameters not usually considered and to 



questions which might be posed in the analysis. 



