Abstract
1. The EEG and heart rate responses were recorded simultaneously during the avoidance conditioning in the rats.
2. Habituation of the EEG and heart rate responses to the CS took about 15 trials and 100 trials, respectively.
3. In the initial stages of the avoidance conditioning there could be seen the marked increases in heart rate response and low voltage fast waves in the EEG response to the CS, both of which were discussed as the signs of high emotional state.
4. In the final stages, the increases in heart rate response were gradually disappearing. Low voltage fast waves of the EEG responses were also gradually disappearing as the avoidance response was becoming automatic.
5. In the early stages of the reality testing there could be seen again the marked increases in heart rate responses and low voltage fast waves of the EEG responses, both of which were discussed as a different emotional reaction from that simply elicited by the CS.
