AKINETOPSIA CASE STUDY

The right temporal spikes on EEG had disappeared. When he was asked to follow the examiner walking in front of him, he was unable to do so. Both EEG and magnetoencephalography showed repetitive right temporal spikes. Abstract Akinetopsia is a rare syndrome in which a patient specifically loses the ability to perceive visual motion following bilateral cortical lesions outside the striate cortex. Furthermore, the symptom disappeared with adequate antiepileptic drug therapy. He frequently commented to his wife that he could not “see anything going on”.

However, the feeling that the whole view was shaking appeared. Although the higher brain mechanisms of seeing moving objects have been deeply investigated, motion blindness remains a rare and enigmatic symptom. On several behavioural tests, TD showed a specific and selective impairment of motion perception that was comparable to LM’s performance. Selective disturbance of movement vision after bilateral brain damage. Because the symptom came to occur several times each day at age 59, he was referred to the Department of Neurosurgery at our hospital. Neurosci Res ;

Dog phobia in a motion-blind patient. While Pelak and Hoyt have recorded an Alzheimer’s case study, there has not been much research done on the subject yet. B Waveforms of MEG spikes recorded in all channels.

Case Report: Invisibility of moving objects: a core symptom of motion blindness

Area V5 of the human brain: One patient had transient akinetopsia in her bilateral visual fields caused from unilateral right hemispheric lesions. However, the lesion remained limited to the right temporoparietal subcortex figure 1 B.

akinetopsia case study

There is currently no effective treatment or cure for akinetopsia. When he played catch with his son, he could not see the ball which his son threw until it hit on his body.

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Most of what is known about this extremely rare condition was learned through the case study of one patient, LM. This symptom appeared subsequent to being aware of a bad feeling and lasted for several seconds. Please review our privacy policy. However she knew the object had changed in position, she knew the size of the cube, and she could correctly judge the distance of the cube in relation to other nearby objects. Detection of movement in the inner and outer visual fields was tested.

InPotzl and Redlich reported a year-old female patient with bilateral damage to her posterior brain. Published online Apr The patient was a year-old man.

Inconspicuous akinetopsia can be selectively and temporarily induced using transcranial magnetic stimulation TMS of area V5 of the visual cortex in healthy subjects. Interrim report of JET-2 study.

Invisibility of moving objects: a core symptom of motion blindness

The akinetopsia often occurs with visual trailing palinopsiawith afterimages being left at each frame of the motion. TD had perfect perception of motion direction at speed up to 9 degrees per second.

Lesions more often cause gross akinetopsia. To determine perception of motion in depth, studies were done in which the experimenter moved a black painted wooden cube on a tabletop either towards the patient or away in line of sight. Although the higher brain mechanisms of seeing moving objects have been deeply investigated, motion blindness remains a rare and enigmatic symptom.

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Akinetopsia as epileptic seizure

He found the ball by the sound of it falling to the ground. Brain ; Pt 2: This symptom was paroxysmal and recurrent. The symptom was observed not only in his daily life but also during investigations in the hospital. Since our patient experienced only the first symptom but not the second one, these two symptoms might occur from different mechanisms. Instead, these objects would appear in one location and then another, without any movement being seen between the two locations.

P85 [ Google Scholar ].

akinetopsia case study

At age 58, he began to have a recurrent visual symptom by which smooth movements of objects suddenly appeared, resembling freeze frames in a motion picture. J Neurol Neurosurg Psychiatry ; Besides memory problems, Alzheimer’s patients may have varying degrees of akinetopsia.

If a few static squares were added to the moving display, identification of direction fell to chance, but identification of the axis of motion was still accurate.

The right temporal spikes on EEG had disappeared. We report a case of a patient who presented with invisibility of moving objects, that is, motion blindness resulting from a unilateral right hemispheric lesion.

akinetopsia case study

Evidence from unilateral cerebral brain damage.