Abstract
Summary
Rats submitted to repeated blunt impacts on the head, the strength of each of which was insufficient to cause any immediate or late ill effects, frequently revealed cumulative effects as shown by unconsciousness, at times followed by death or by persisting changes in behavior. A certain correspondence was found between the response to the trauma during life and the amount and degree of cerebral damage at post mortem examination, which consisted mainly of degenerative changes in neurons detected by present histological methods.
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