Comparative effects of ageing and dementia of the Alzheimer type onorientation of visual attention
M. Wright
Bok Engelsk 1997
| Utgitt | 1997
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|---|---|
| Omfang | Side 366- 375
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| Opplysninger | Age-related changes and the effects of dementia of the Alzheimer type(DAT) were investigated during a visual orienting attention task inwhich attention was pre-cued to one or other hemifields. Central cueswere either valid, neutral, invalid or NoGo (inhibitory). Theresponse time cost-benefit analysis showed a decreased benefit aftervalid cueing in the old compared with the young group with no changein the cost of invalid cueing. The older group were also slower overall cue types. These results suggest there is an age-related reducedability to covertly orient attention in a visual hemifield beforetarget onset. In contrast, the DAT group showed an increased responsetime benefit and showed a trend for a decreased cost in response timecompared with controls. This was due to slowest response times afterneutral cues. They also made significantly more response errorsparticularly following neutral cueing, and were less able to inhibitresponses on NoGo trials than controls. The increased benefit andreduced cost found in the DAT group was interpreted as an impairmentin dividing attention between left and right target locations.
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| Emner |
