A hypothesis was made that hyperactivity as stated by others was not a direct result of brain anoxia produced in pre and post-natal factors, but that they share a common genetic cause.
A comparison between four Mz. and six Dz. sets of twins were made. It was found that all Mz. pairs were male and concordant to hyperactivity. In the Dz. group all pairs were discordant except one male-male combination. Also in the Dz. group hyperactivity was always present in the male partners but for one discordant pair where the syndrome was present in the female.
The importance of genetics as a causative factor was not obviously due to the small amount of hyperactive females studied in this project.
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