BlindSight (itch) (GEsi) Mac OS

  1. Aug 27, 2020 For more information about these gestures, choose Apple menu System Preferences, then click Trackpad. You can turn a gesture off, change the type of gesture, and learn which gestures work with your Mac. Trackpad gestures require a Magic Trackpad or built-in Multi-Touch trackpad.
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ZoomText Mac for Blind and Low Vision Apple Computer Access. Apple maintains strict restrictions on the operating system access they allow third-party vendors to use, so at present there is only one third-party screen accessibility product available for OS X. Ai Squared offers a low-vision product called ZoomText Mac. Blindsight is the ability of people who are cortically blind due to lesions in their striate cortex, also known as the primary visual cortex or V1, to respond to visual stimuli that they do not consciously see. The term was coined by Lawrence Weiskrantz and his colleagues in a paper published in Brain in 1974. A similar paper in which the discriminatory capacity of a cortically blind patient. Blindsight is a phenomenon that shows that even when the primary visual cortex is damaged or removed a person can still perform actions guided by unconscious visual information. So even when damage occurs in the area necessary for conscious awareness of visual information, other functions of the processing of these visual percepts are still.

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Date:
October 16, 2008
Source:
National Institute for Physiological Sciences
Summary:
Blindsight is a phenomenon in which patients with damage in the primary visual cortex of the brain can tell where an object is although they claim they cannot see it. Scientists now provide compelling evidence that blindsight occurs because visual information is conveyed bypassing the primary visual cortex.
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Blindsight is a phenomenon in which patients with damage in the primary visual cortex of the brain can tell where an object is although they claim they cannot see it. A research team led by Prof. Tadashi Isa and Dr. Masatoshi Yoshida of the National Institute for Physiological Sciences, Japan, provides compelling evidence that blindsight occurs because visual information is conveyed bypassing the primary visual cortex. Japan Science and Technology Agency supported this study.

The researchers recorded eye movements of Japanese monkeys that had damage in one side of the primary visual cortex. Training with an eye movement task for 2-3 months enabled the monkeys to move their eyes to the correct direction where an object was even in the affected side of their visual fields. Brain became able to feel where an object was without 'seeing' it. After the training, their eye movements looked almost normal; they discriminated five different directions even in the affected visual field.

To investigate how eyes move, the monkeys' eye movements to targets in their affected visual field were compared with those to dark targets in their normal visual field. Both were 'equally difficult to see'. By this trick, the researchers found two differences from the normal: 1) the trajectory of their eye movements was straight and 2) the response time of their eye movement was short. These differences were thought to be due to the damage of eye movement control and decision making, not purely on that of vision. Therefore, the researchers concluded that the monkeys' eye movements after damage in the primary visual cortex were mediated by a qualitatively different vision which is supported by alternative brain circuits bypassing the primary visual cortex.

'Our finding will provide a new strategy for rehabilitation of these patients with damage in the primary visual cortex. That will be a rehabilitation training to activate alternative brain circuits to see what you do not see', said Dr. Yoshida. 'A similar training may help the patients to know where an object is even without 'seeing' it.'

The team reports their finding in the Journal of Neuroscience on Oct 15, 2008.

Story Source:

Materials provided by National Institute for Physiological Sciences. Note: Content may be edited for style and length.

Cite This Page:

National Institute for Physiological Sciences. 'Blindsight: How Brain Sees What You Do Not See.' ScienceDaily. ScienceDaily, 16 October 2008. <www.sciencedaily.com/releases/2008/10/081014204444.htm>.

Blindsight (itch) (gesi) Mac Os Update

National Institute for Physiological Sciences. (2008, October 16). Blindsight: How Brain Sees What You Do Not See. ScienceDaily. Retrieved May 1, 2021 from www.sciencedaily.com/releases/2008/10/081014204444.htm
National Institute for Physiological Sciences. 'Blindsight: How Brain Sees What You Do Not See.' ScienceDaily. www.sciencedaily.com/releases/2008/10/081014204444.htm (accessed May 1, 2021).

  • RELATED TERMS
    • Visual cortex
    • Occipital lobe
    • Optic nerve
    • Bitemporal hemianopsia
    • Visual field
    • Visual perception
    • Eye examination
    • Visual acuity
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