Brain innately separates living and non-living objects for ...(ng things in an area that is optimized f...)

To see if the appearance of objects is indeed key to how the brain conducts its processing, Mahon and his team, led by Alfonso Caramazza, director of the Cognitive Neuropsychology Laboratory at Harvard University, asked people who have been blind since birth to think about certain living and non-living objects. These people had no visual experience at all, so their brains necessarily determined where to do the processing using some criteria other than an object's appearance.

"When we looked at the MRI scans, it was pretty clear that blind people and sighted people were dividing up living and non-living processing in the same way," says Mahon. "We think these findings strongly encourage the view that the human brain's organization innately anticipates the different types of computations that must be carried out for different types of objects."

Mahon thinks it's possible that other parts of the human brain are innately structured around categories of knowledge that may have been important in human evolution. For instance, he says, facial expressions need a specific kind of processing linked to understanding emotions, whereas a landmark needs to be processed in conjunction with a sense of spatial awareness. The brain might choose to process these things in different areas of the brain because those areas have strong connections to other processing centers specializing in emotion or spatial awareness, says Mahon.

Mahon is now working on new experiments designed to further our understanding of how the brain represents knowledge of different classes of objects, both in sighted and blind individuals, as well as in stroke patients.

'/>"/>