The hemispheres are not equalA study analyzes differences in brain asymmetry among different individuals Although the brain is divided into two halves, it is not exactly a mirror image. Some functions are processed more on the left side, others more on the right - and each person's processing is a little different. Scientists at the Max Planck Institute for Human Cognitive and Brain Sciences and Forschungszentrum Juelich, together with an international team of neuroscientists, have now discovered heritable underpinnings of brain asymmetry - and - how much we share with monkeys.