Eysenck's model of neurotigenesis

Trauma Revaluation, Conditioning, and Anxiety Disorders

This paper describes a two-component conditioning model of anxiety disorders whose two main components are an associative process and a process which determines the evaluation of the unconditioned stimulus (UCS). It is argued that the inclusion of UCS revaluation processes enables conditioning models to explain a variety of anxiety-related phenomena that hitherto had been difficult to explain solely in associative terms. In particular, (a) experiments are described which suggest that incubation of the conditioned response (CR) can be explained in terms of processes contributing to UCS inflation, (b) the experimental evidence on UCS revaluation is assessed in relation to cognitive processes that might lead to trauma revaluation within specific anxiety disorders, and (c) the role of personality factors in effecting UCS and trauma revaluation is discussed.

Incubation of Anxiety: A Theory Prematurely Hatched

In a recent paper Eysenck asked why conditioned responses show incrementation. In several publications he has provided the outline of an answer, which he has used in proposing a theory of the development of neuroses. It is suggested here that in the way he sets out the problem and in the development of his theory of incubation he overstates the applicability of the theory, incorporates questionable assumptions, and omits thorough consideration of competing accounts. The theory focuses on classical conditioning to the near-exclusion of other processes of behaviour change, ignores the consequences and social context of neurotic behaviour, and provides an incomplete discussion of the temporal patterning of relevant events. By taking a view which is broader in terms of psychological processes, environmental events, and temporal sequences, alternative models of the development of phobias can be offered. These involve classical and operant conditioning, and observational and informational learning.

Eysenck's incubation of fear hypothesis: an experimental test

The present experiment was designed to test Eysenck's hypothesis that repeated exposure to an unreinforced CS of brief duration following acquisition of a classical aversive CR may lead to a progressive increase in the strength of that CR, provided that the UCS is intense and the CR has drive-like properties. Using a between-groups design, normal human subjects were given identical classical acquisition trials, followed by extinction trials where CS duration was either 2, 8 or 16 sec. The UCS was of fixed high intensity. Dependent measures were tonic and phasic heart rate and skin conductance. No evidence of incubation was found as a function of CS duration. Nor was there any indication that CS duration differentially affected resistance to extinction. A small number of subjects showed evidence of incubation with heart rate measures during extinction. However, there was no indication that this enhancement was governed by the parameters suggested by Eysenck. UCR amplitude, which showed a positive correspondence with CS-bound activity throughout the trials, did not reliably predict incubation. Problems concerning both the definition and the demonstration of incubation are discussed.