All these seminal works on hemispheric specialization were done on patients and/or postmortembrainspostmortem brains, raising questions about the factspotential inimpact healthyof subjects.pathology on the research findings. Nowadys,newNew methods peritpermit the ''[[in vivo]]'' comparision of the hemispheres in healthy subjects. Particularly, [[magnetic resonance imaging]] (MRI) and [[positron emission tomography]] (PET) are of importance becuasebecause of goodtheir high spatial resolution theyand ability to image subcortical brain supplystructures.
