Speed of perceptual grouping in acquired brain injury
| Autor: | Farhan Bukhari, Daniel D. Kurylo, Gabriella Brick Larkin, Richard Waxman |
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| Rok vydání: | 2013 |
| Předmět: |
Adult
Male Traumatic brain injury Perceptual Masking Stimulus (physiology) Perceptual Disorders Sensory threshold Orientation medicine Psychophysics Reaction Time Humans Acquired brain injury Aged Aged 80 and over General Neuroscience Information processing Middle Aged medicine.disease Pattern Recognition Visual Brain Injuries Sensory Thresholds Female Psychology Neuroscience Photic Stimulation |
| Zdroj: | Experimental brain research. 232(9) |
| ISSN: | 1432-1106 |
| Popis: | Evidence exists that damage to white matter connections may contribute to reduced speed of information processing in traumatic brain injury and stroke. Damage to such axonal projections suggests a particular vulnerability to functions requiring integration across cortical sites. To test this prediction, measurements were made of perceptual grouping, which requires integration of stimulus components. A group of traumatic brain injury and cerebral vascular accident patients and a group of age-matched healthy control subjects viewed arrays of dots and indicated the pattern into which stimuli were perceptually grouped. Psychophysical measurements were made of perceptual grouping as well as processing speed. The patient group showed elevated grouping thresholds as well as extended processing time. In addition, most patients showed progressive slowing of processing speed across levels of difficulty, suggesting reduced resources to accommodate increased demands on grouping. These results support the prediction that brain injury results in a particular vulnerability to functions requiring integration of information across the cortex, which may result from dysfunction of long-range axonal connection. |
| Databáze: | OpenAIRE |
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