EXPERIMENTAL clarification of the relationships between coincident physiological and psychological activity remains a difficult problem because many internal factors interact among themselves and with external stimulation in determining physiological and psychological responses. Many of these relevant factors have been studied in the past.
The Laceys,1,2 Wilder,3 Block and Bridger,4 and others5 have shown that base levels of autonomic activity and individual differences in responsivity affect physiological responses. Ax,6 Schachter,7 Funkenstein,8 and Mordkoff9 have shown that physiologic changes can be correlated with experimental manipulations that induce affective responses within subjects. Wolff, Mason, and their coworkers,10,11 and Sachar12 have been interested in how subjects deal with chronic stress and have demonstrated that adaptive success in the face of chronic stress is meaningfully correlated with low levels of endocrine secretion, while relative failure to master stress
KAFKA E, REISER MF. Defensive and Adaptive Ego ProcessesTheir Relationship to GSR Activity in Free Imagery Experiments. Arch Gen Psychiatry. 1967;16(1):34-40. doi:10.1001/archpsyc.1967.01730190036004