Occipitotemporal lesions may cause agnosia associated with abnormalities in visual perception including An inability to recognize familiar places (environmental agnosia) Visual disturbances (visual agnosia) Color blindness (achromatopsia) Right-sided temporal lesions may cause An inability to interpret sounds (auditory agnosia) Impairment of music perception (amusia) Diagnosis of Agnosia Neurologic examination Neuropsychologic testing Brain imaging At bedside, patients are asked to identify common objects through sight, touch, or another sense.