Abstract
1. 1. Active vision and visual recall are associated with blocking or attenuation of the alpha rhythms, active vision producing the greater degree of change. Non-visual imagery is associated with their persistence. Alpha activity is also blocked non-specifically by anxiety. 2. 2. All the EEGs in this series were of the R type, almost certainly due to the fact that the subjects were a highly selected group with versatile modes of thought, whereas the Bristol series (1943) consisted of an unselected group. 3. 3. The EEGs showed every grade of change between the M and P types, suggesting that these simply represent the two extremes of a continuous gradation of changes. 4. 4. Individuals use different types of imagery with differing degrees of ease and preponderance. Just as the M, P, and R types of record are correlated with distinct varieties of thinker, so, within certain limits, the several properties of the alpha rhythms, in a “resting” record can be correlated with a subject's ease and habitual use of visual imagery. 5. 5. In correlating mental activity with changes in the EEG, as much attention must be paid to analysing the individual properties of a person's mental processes (psychological information) as to the features of the EEG.
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