التفاصيل البيبلوغرافية
| العنوان: |
Effects of Task Structure on Category Priming in Patients With Parkinson'sDisease and in Healthy Individuals. |
| المؤلفون: |
Brown, Gregory G., Brown, Sandra J., Christenson, Gina, Williams, Rebecca E., Kindermann, Sandra S., Loftis, Christopher, Olsen, Ryan, Siple, Patricia, Shults, Clifford, Gorell, Jay M. |
| المصدر: |
Journal of Clinical & Experimental Neuropsychology; May2002, Vol. 24 Issue 3, p356, 14p |
| مصطلحات موضوعية: |
TASK analysis, PARKINSON'S disease, TONE (Phonetics), SEMANTICS |
| مستخلص: |
Lexical decision tasks have been used to study both shifts of attentionand semantic processing in Parkinson's Disease (PD). Whereas other laboratorieshave reported normal levels of semantic priming among PD patients, our laboratoryhas reported abnormally large levels. In this study, two experiments wereperformed to determine the influence of task structure on the extent of semanticpriming during lexical decision-making and pronunciation tasks among PD patientsand neurologically healthy controls. In Experiment 1, the effect of PrimeDominance (the ratio of category to neutral trials) on lexical decision-makingwas studied. Although equal numbers of word and nonword trials were presented,half of the PD patients and controls were studied under Category Prime Dominance(category : neutral prime ratio of 2:1) and half were studied under NeutralPrime Dominance (category : neutral prime ratio of 1:2). In Experiment 2,PD and control participants were studied on lexical decision-making and pronunciationtasks where twice as many words as nonword trials were presented, consistentwith other studies from our laboratory. In Experiment 1, we found no groupdifferences in the magnitude of priming and no effect of Prime Dominance.Moreover, the findings were similar in pattern and magnitude to results publishedby Neely (1977). In Experiment 2, we observed larger priming effects amongPD patients than among controls, but only on the lexical decision (LD) task.These results support the hypothesis that abnormally large category-primingeffects appear in LD studies of PD patients when the number of word trialsexceeds the number of nonword trials. Furthermore, increased lexical primingin PD appears to be due to processes operating during the decision-makingperiod that follows presentation of the lexical target. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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