Interspecies differences in the occurrence of theta.

Evidence regarding the behavioral correlates of theta activity in the rat, guinea pig, rabbit, and cat is reviewed. It is suggested that the plethora of theories and the contradictions that have arisen in the interpretation of this evidence are due to the implicit assumption that there must be a correlation of theta activity with specific behaviors that will hold across species. It is concluded that this assumption is untenable and that the data indicate that there is a distinct set of theta-correlated behaviors for each species. These behaviors may correspond to important natural behaviors of the species.

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