The influence of speed and interval variation of serial stimuli on physiological change

Studied changes in heart rate (HR), heart rate variability (HRV), blood volume pulse (BVP), respiration speed (RS), and alpha rhythm (AR) under conditions of the variation of the speed and intervals of auditory stimuli in a serial 2-choice response task. The analysis of variance of the percentage scores revealed that the differences between the 3 speed levels, the 5 physiological variables, and also the 2nd-order interaction between the speed of presentation and the physiological variables were significant. The difference between the interval variation levels was not significant. The short-term effect of step-wise variation of the duration of intervals between successive stimuli on physiological change was also investigated and an explorative study was made of the periodic fluctuations of 3 physiological variables by applying the techniques of auto-correlation and power spectrum analysis