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Visual attention and perception in patients with Huntington's disease: comparisons with other subcortical and
J V Filoteo1, D C Delis, M J Roman
1Department of Psychology, University of Utah, Salt Lake City 84112, USA.
Insights
Huntington's disease patients show normal attention shifting between visual levels, unlike Alzheimer's and Parkinson's patients. This suggests distinct attentional mechanisms underlie visual deficits in these neurodegenerative diseases.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Clinical Neurology
Background:
- Attention shifting is crucial for cognitive function.
- Neurodegenerative diseases like Alzheimer's (AD), Parkinson's (PD), and Huntington's (HD) impact cognitive abilities, including attention.
- Previous research identified distinct attentional deficits in AD and PD patients.
Purpose of the Study:
- To investigate attention shifting abilities in Huntington's disease (HD) patients.
- To compare the attentional performance of HD patients with that of AD and PD patients.
- To explore the relationship between attentional deficits and visual-perceptual impairments in these patient groups.
Main Methods:
- Utilized a divided attention paradigm with global-local visual stimuli.
- Presented visual targets at consistent or changing hierarchical levels across trials.
- Compared performance patterns of HD patients to previously published data from AD and PD patient groups.
Main Results:
- AD patients showed impaired attention disengagement, while PD patients had difficulty maintaining attention.
- HD patients did not exhibit significant impairments in shifting attention between hierarchical levels.
- Attentional shifting deficits in AD and PD were linked to visual-perceptual errors, but in distinct ways.
Conclusions:
- Huntington's disease appears to involve different attentional mechanisms compared to Alzheimer's and Parkinson's disease.
- The visual-perceptual impairments in HD may stem from mechanisms distinct from those affecting attention shifting.
- Understanding these differential attentional mechanisms can inform targeted interventions for neurodegenerative diseases.
Abstract:
Shifts in attention were examined in patients with Huntington's disease (HD) using a divided attention paradigm that involved the presentation of global-local stimuli. The HD patients' pattern of performance was compared to the previously reported results of groups of patients with Alzheimer's disease (AD; Filoteo et al., 1992) or Parkinson's disease (PD; Filoteo et al., 1994). Across consecutive trials of the divided attention task, a visual target could appear at either the same global-local level or at a different level. When the target changed levels across consecutive trials, the AD patients demonstrated an impairment in disengaging attention from the level at which the last target appeared, whereas the PD patients were impaired in maintaining their attention at the previously attended level. In contrast to these patterns of performances, the HD patients did not demonstrate a significant impairment in shifting attention between hierarchical levels. Both the AD and the PD patients' abnormal shifting ability was significantly related to the number of errors they made in identifying target stimuli; however, the pattern of the relationship was qualitatively distinct. These results suggest that different attentional mechanisms may underlie AD and PD patients' visual-perceptual deficits. The HD patients' shifting ability was not related to the number of errors they made in identifying target stimuli, suggesting that a different mechanism may account for the visual-perceptual impairments exhibited by these patients.