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In order to clarify further the relationship between environmental stimulation and developmental status in infancy, an experiment was carried out to examine the proposition that scores on developmental tests may vary according to the level of current stimulus input. Two groups of infants were tested on three successive days under identical conditions, except that one group was tested after a brief no‐stimulation period on all three days, while the other group received the no‐stimulation treatment only on the first day and a stimulation period on the second and third days. Results indicate a highly significant rise in DQ as a result of stimulation, and are interpreted in terms of changes in arousal level.

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