Blindtouch

Jaques Paillard proposed to name the ability to point to the location of touch without consciously perceiving that touch "blindtouch." It has been explored in two patients suffering from complete anaesthesia of one half of the body. They were blindfolded and asked to point with their intact hand to the location of touch on their anesthetic hand. The accuracy of pointing was reduced but was definitely above chance, even for discriminations between proximal and distal portions of single fingers. One patient commented, "But I don't understand that! You put something here. I don't feel anything and yet I go there with my finger. How does that happen?'' Localization was restricted to direct pointing and did not differ from chance when a patient was asked to indicate the localization of touch by pointing to a picture of a hand or by a selection between verbally proposed localizations. When verbal responses were given simultaneously with direct pointing, the verbal errors captured the motor response and pointing accuracy decreased to chance.

Blindtouch can be considered as being the opposite of movement control in deafferented patients. In blindtouch, the implicit processing of somatosensory information about locations on the body seems to be preserved in the absence of any explicit representation of the same information, whereas in deafferented patients the explicit representation of the body is used for compensating the absence of implicitly processed somatosensory afferences.

All About Alzheimers

All About Alzheimers

The comprehensive new ebook All About Alzheimers puts everything into perspective. Youll gain insight and awareness into the disease. Learn how to maintain the patients emotional health. Discover tactics you can use to deal with constant life changes. Find out how counselors can help, and when they should intervene. Learn safety precautions that can protect you, your family and your loved one. All About Alzheimers will truly empower you.

Get My Free Ebook


Post a comment