Abstract
1. 1. To determine whether pairing of two signals was necessary to produce a “conditioned” alpha blocking response, the EEG responses in fourteen subjects were first habituated to tone. Following repeated, independent exposure to a flickered light stimulus, 57% of the subjects showed 79% alpha blocking responses to three test tones. This blocking was shown not to be a matter of spontaneous recovery as a function of lapsed time. 2. 2. Forty paired tone-light trials were presented randomly while the subject's eyes were open and there was no alpha rhythm visible in the EEG. When three test tones were presented while eyes were closed and alpha rhythm appeared in the EEG, 57% of the subjects showed 88% blocking responses. 3. 3. The results indicate that the level of “conditioning” of alpha blocking achieved in previous studies does not necessarily require paired stimuli or the presence of obvious alpha rhythm in the EEG. Experiments involving the conditioning of cerebral electrical activity should be interpreted in light of these findings.
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