HUMAN brains appear to come in at least two flavours: male and female. Now variations in the density of the synapses that connect neurons may help to explain differences in how men and women think.
Women and men tend to excel at different cognitive tasks, but although brain size and neuron density differ between the sexes, these don’t seem to correlate with cognitive differences. So Javier DeFelipe at Complutense University in Madrid, Spain, and colleagues counted instead the number of synapses.
The brain tissue came from the left temporal cortex, involved in emotional and social processing, of four women and…
