People with associative
agnosia can correctly perceive objects presented visually, and therefore
successfully perform basic tasks that those with apperceptive agnosia fail, but
cannot assign meaning to visual stimuli.
Can be caused by left occipital and temporal lobe
lesion, often in conjunction with damage to the posterior thalamus and limbic cortex.
with associative agnosia cannot
associate visually-presented objects with their
semantic meaning, or organize objects into semantic categories.
It has become apparent that the
boundaries of associative and apperceptive agnosia are not nearly as clear as
once was thought, and that the distinction between these two disorders
matter of degree rather than an absolute.