THE PSEUDAFFECTIVE STATE AND DECEREBRATE RIGIDITY IN THE SLOTH

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Abstract
Shock which follows transaction of the brain in the sloth is profound for about 5 mins., and usually disappears in 10-15 mins. Considerable activity, apparently spontaneous, is shown by sloths which have been deprived of large cortical areas, including those dominating motor reactions in higher forms. A pseudaffective state, not significantly different from that observed in higher mammals, appears following removal of the upper parts of the tardigrade cortex. This condition may persist even after brain section has been made to very low levels. Decerebrate rigidity in the sloth may be either flexor or extensor in type; the former is observed somewhat more frequently. Extensor rigidity is usually more evident during the latter part of the post-operative survival period, and is classical in type. Temp., pulse and respiratory rates were well maintained in the decerebrate sloth.

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