( Gray, 1972). Given our previous discussion of likely interactions between the behavioral inhibition and fight/flight systems, there is some reason to consider both the balance between, and the summation of, the reactivities of these two systems as possessing their own neurological reality. If, for example, Graeff ( 1987; see earlier) is correct in his speculations concerning the role of the central gray in determining the symptoms and course of panic attacks, we might see the occurrence of such attacks as depending on the momentary balance between the behavioral inhibition and fight/flight systems; and the individuals who are prone to them, as having chronically high reactivity in both systems.
One can obviously use the approach and fight/flight systems to construct yet a third two-dimensional diagram (not to mention the three-dimensional diagram that one obtains by putting all three systems together simultaneously; see Gray, 1983, for one attempt along these lines). But I desist from playing what is still at present an amusing game. It will cease to be a game if and when we are able to situate with confidence relevant diagnostic categories, whether among adults or children, at appropriate points in the space that houses these speculations.
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