. . . "destructive lesions never cause positive effects, but induce a negative condition which permits positive symptoms to appear," has become one of the hall-marks of English neurology. (212) H. head
Excitation rather than inhibition is important in correlation because from what has been said it appears that so far as known inhibition is not transmitted as such. The existence of inhibitory nervous correlation is of course a familiar fact, but in such cases the inhibitory effect is apparently produced, not-by transmission of an inhibitory change, but by transmission of an excitation and the mechanism of the final inhibitory effect is still obscure. (92) charles m. child
But since inhibition is not a static condition but a mode of action, the mechanism of the total pattern must be regarded as participating in every local reflex. (io7) g. e. coghill
It is highly probable that excitation and inhibition, the two functions of the nerve cell which are so intimately interwoven and which so constantly supersede each other, may, fundamentally, represent only different phases of one and the same physico-chemical process. (394) 1. p. pavlov
The term 'unconditional reflex' applies only under 'normal' or 'natural' conditions, as we know that different drugs, such as ether, which alter the conductivity of nervous tissue., can also alter its irritability. Similarly, with conditional reactions, the introduction of degrees of conditionality becomes an important oo-valued structural refinement of language, depending on, and introducing explicitly or by implication, the number of factors, the degrees of freedom., which are observed empirically, and so should have a linguistic and semantic parallel.
If we disregard, for instance, the possibility of the use of a drug., then the 'unconditional' reactions are largely unconditional. The 'conditional reflexes' in animals are a much subtler form of adjustment to many more factors, and if we call them 'conditional of lower orders' we cover structurally their limited conditionality, which with higher animals is considerable. For example, a fly in the laboratory might disturb the reactions, but merely 'intellectual' interference would be ineffective. And, finally, the 'conditional reactions of higher orders' in man involve still more factors, introduce more and new complexities, and necessitate that the human reactions should be fully conditional, requiring oo-valued semantics. At present, this is an exceptional occurrence, although the potentiality for such full conditionality is present in the majority of us.
The mechanism of the unconditional reaction is, Under ordinary circumstances, almost automatic. It is evolved on the background of