Abstract
The incidence of eidetic imagery and prolonged after-imagery was investigated in a population of young retardates. Incidence of eidetic imagery was 19%, significantly higher than normal samples, and all children with eidetic imagery were classified as “brain-injured” by common neurological diagnostic criteria. Children with long, stable afterimages had a significantly higher mean IQ than those with short afterimages, capacity for fixation and task learning being controlled. A possible explanation of the IQ discrepancy in terms of how a longer time to process visual input into short-term memory may be functional for children of low intelligence is presented.

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