Agnosia
People with damage to certain areas of the brain can develop agnosia. A man with agnosia described a rose as 'about six inches in length, a convoluted red form with a linear green attachment', and a glove as 'a continuous surface infolded on itself, it appears to have five outpouchings'. He could neither name the objects nor recognise what they were used for. Occasionally, agnosia is limited to failure to recognise faces. In one case, a farmer was unable to recognise his friends and family, but had no problems identifying his sheep!
