So, like age - related overactivation generally, this age - related alteration in
hemispheric specialization, a pattern dubbed «hemispheric asymmetry reduction in older adults» or HAROLD (Cabeza, 2002), means that cognitive neuroscience studies of brain aging are raising new questions with broad neuroscientific implications (Figure 1A).
Since this asymmetric sound processing is the basis for left
hemispheric specialization for language, it too is assumed to be more common in men than in women.
One Oxford neurobiologist went so far as to argue that right - handedness could be traced back 200,000 years to a single mutation — a sort of genetic Big Bang that created
hemispheric specialization, language, and higher cognitive functioning in one go.
Aside from humans, no other animal that has been studied, not even monkeys or apes, has proved to use such
hemispheric specialization for sound processing — meaning that the left brain is better at processing fast sounds, and the right processing slow ones.