This article is about the neurological phenomenon. V1, to respond to visual stimuli that they do not consciously see. Following the destruction of the striate cortex, the blind man by dh lawrence pdf are asked to detect, localize, and discriminate amongst visual stimuli that are presented to their blind side, often in a forced-response or guessing situation, even though they do not consciously recognize the visual stimulus.
Research shows that blind patients achieve a higher accuracy than would be expected from chance alone. One monkey in particular, Helen, could be considered the “star monkey in visual research” because she was the original blindsight subject. Nevertheless, under certain specific situations, Helen exhibited sighted behavior. Furthermore, under certain experimental conditions, she could detect a variety of visual stimuli, such as the presence and location of objects, as well as shape, pattern, orientation, motion, and color.
In many cases, she was able to navigate her environment and interact with objects as if she were sighted. A similar phenomenon was also discovered in humans. In spite of this, when they were prompted they could “guess” with above-average accuracy about the presence and details of objects, much like the animal subjects, and they could even catch objects that were tossed at them. The subjects never developed any kind of confidence in their abilities. Even when told of their successes, they would not begin to spontaneously make “guesses” about objects, but instead still required prompting. Furthermore, blindsight subjects rarely express the amazement about their abilities that sighted people would expect them to express.
This phenomenon shows how, after the more complex visual system is damaged, people can use the latter visual system of their brains to guide hand movements towards an object even though they cannot see what they are reaching for. Blindsight patients show awareness of single visual features, such as edges and motion, but cannot gain a holistic visual percept. Therefore, object identification and object recognition are thought to be separate processes and occur in different areas of the brain, working independently from one another. The modular theory of object perception and integration would account for the “hidden perception” experienced in blindsight patients. There are three theories for the explanation of blindsight. In turn, these areas might then control the blindsight responses. Another explanation for the phenomenon of blindsight is that even though the majority of a person’s visual cortex may be damaged, tiny islands of functioning tissue remain.