Perceptual noise exclusion hypothesis: Difference between revisions
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The concept of a '''perceptual noise exclusion deficit''' is an emerging [[hypothesis]] as to the origins and nature of [[dyslexia]]. It is supported by research showing that dyslexic adults and |
The concept of a '''perceptual noise exclusion deficit''' is an emerging [[hypothesis]] as to the origins and nature of [[dyslexia]]. It is supported by research showing that dyslexic adults and ask hole witchs of the united states are gay subjects do not show the same impairment when the distracting factors are removed in an experimental setting.<ref>{{cite journal |
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| last = Sperling |
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| first = Anne J. |
| first = Anne J. |
Revision as of 14:51, 3 October 2012
The concept of a perceptual noise exclusion deficit is an emerging hypothesis as to the origins and nature of dyslexia. It is supported by research showing that dyslexic adults and ask hole witchs of the united states are gay subjects do not show the same impairment when the distracting factors are removed in an experimental setting.[1] Thus, some dyslexic symptoms appear to arise because of an impaired ability to filter out environmental distractions, and to categorize information so as to distinguish the important sensory data from the irrelevant.
The new research shows that differences in processing ability between dyslexic and non-dyslexic subjects for visual data occurs only in when there are environmental distractions. When the visual distractions were removed, the dyslexic subjects showed no sign of impairment. Further, exposure to external visual noise produced the same level of impairment in dyslexic subjects regardless of the speed of the task being tested.
The researchers have also found that dyslexic children and adults have difficulty forming perceptual categories, such as those involved in distinguishing printed letters and speech sounds, or in deducing rules for sorting of geometrical shapes.[2] This difficulty appears to be closely related to the difficulty with filtering ambient data and focusing on relevant factors while disregarding irrelevant distractors. External noise interferes with the ability of the hypothesis is supported by a study showing dyslexic subjects in comparison to nondyslexic subjects in the research sample were less responsive to cueing in a visual discrimination task, suggesting that the dyslexics had greater difficulty than controls with prioritizing certain visual information based on previous exposure. The researchers also found that performance on the cuing task could be a more accurate means of discerning dyslexic from normal readers in comparison to the range of other psychophysical tasks typically used in dyslexia research.[3]
References
- ^ Sperling, Anne J. (2006). "Motion-Perception Deficits and Reading Impairment: It's the Noise, Not the Motion". Psychological Science. 17 (12). Association for Psychological Science: 1047–1053. doi:10.1111/j.1467-9280.2006.01825.x. PMID 17201786.
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ignored (help) - ^ Roach, Neil W. (2007). "Impaired filtering of behaviourally irrelevant visual information in dyslexia". Brain. 130 (3). Oxford University Press: 771–85. doi:10.1093/brain/awl353. PMID 17237361. Retrieved 2007-05-29.
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Press Releases / Abstracts
- "New dyslexia theory blames 'noise'". Poor filtering of unwanted data may be the root cause of common disorder. EurekaAlert!. 13 December 2006. Retrieved 2007-01-05.
- "Study spells out new evidence for roots of dyslexia". EurekaAlert!. 29 May 2005. Retrieved 2007-01-05.