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As a base for comparison with injury effects, the waking and sleeping electroencephalogram EEG and the somatic and visual evoked responses SER and VER were investigated first. Unusually high voltage occipital waves and a propensity for photic driving characterized the EEG. Controlled blows to the occiput in 10 animals produced reversible depression of consciousness in only four. Recovery of the SER and of consciousness paralleled each other. With injuries causing prolonged or irreversible loss of consciousness, the later EEG showed depression or large amplitude slow waves, which became isoelectric if the blow was fatal. Science —,

Though chimpanzees and humans share about 99 percent of the same DNA, numerous physical and behavioral traits separate us from our closest living relatives. But are we different even when it comes to sex? Just how do chimpanzees "do it? Chimpanzees Pan troglodytes live in hierarchical communities of several dozen individuals. An alpha male sits at the top, females are at the bottom, and all other males rank linearly in between. Like humans, chimpanzees have sex year-round. When a female is in heat, the skin around her genitals becomes pink and swollen — a clear sexual signal to males.

They're primal preoccupations for humans and our close relatives, chimpanzees. For years Homo sapiens scientists have watched those appetites play out among Pan troglodytes with mixed results. Female chimps average five to six years between births, one of the longest intervals of any mammal. To raise the odds of reproducing, a female will mate "with most or all of the males she knows," says primatologist Melissa Emery Thompson of the University of New Mexico, while a male will compete or fight with other would-be sires. Some studies report cases of male chimps trying to sweeten the deal: sharing game they killed, or crops they filched, with females that mated with them.

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