| Abstract: | ![]()
The present study investigated amplitude of the skin conductance response (SCR), heart rate response (HRR), and linger pulse volume (FPV) response components of the orienting response to a change in lone frequency following habituation training. Experimental subjects received either 5 or 20 presentations of a 1000 Hz, 70 dB training stimulus of 3 sec duration followed by presentation of a test stimulus. Half of these subjects received a test stimulus of 670 Hz (decrease of 250 mels), while for the other half, the test stimulus was a 380 Hz (decrease of 500 mels) tone. Two independent control groups received 6 and 21 presentations of the training stimulus respectively. This resulted in a 3 × 2 factorial design (N = 90). The results indicated that test trial SCR amplitude was significantly larger in experimental groups than in control groups and that larger responses occurred for a change of 500 mels than for one of 250 mels. Experimental groups also displayed significantly larger HRRs than did control groups, but within (he experimental groups, response amplitude was not influenced by amount of change. Length of training had no significant effect on either SCR or HRR amplitude on the test trial. For digital vasoconstriction, experimental groups displayed significantly larger FPV responses than did the control groups only after 2(1 training trials, and response amplitude was not influenced by amount of stimulus change. |
