Blindness to form from motion despite intact static form perception and motion detection.

Journal article

We studied the motion perception, including form and meaning generated by motion, in a hemianopic patient who also had visual perceptual impairments in her seeing hemifield as a result of a lesion in ventral extrastriate cortex. She was unable to recognise 2- or 3-dimensional forms, and even borders, generated by motion alone, failed to recognise mimed actions or the Johannson 'biological motion' display, and ceased to recognise people well-known to her when they moved. Her performance with static displays, although impaired, could not explain her inability to perceive shape or derive meaning from moving displays. Unlike a motion-blind patient, she can still see and describe the motion, with the exception of second-order motion, but not what it creates or represents.

Authors: Cowey, A; Vaina, L

• Publication status: Published
• Journal: Neuropsychologia
• Volume: 38
• Issue: 5
• Pages: 566-578
• Publication date: 2000-01-01
• DOI: 10.1016/s0028-3932(99)00117-7
• EISSN: 1873-3514
• ISSN: 0028-3932
• Language: English
• Keywords: Cerebral Infarction; Depth Perception; Perceptual Disorders; Humans; Female; Stroke; Magnetic Resonance Imaging; Photic Stimulation; Neuropsychological Tests; Form Perception; Motion Perception; Color Perception; Aged; Brain