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Sökning: WFRF:(Yonker JE)

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1.
  • Yonker, Julie E, et al. (författare)
  • Negative association of testosterone on spatial visualization in 35 to 80 year old men.
  • 2006
  • Ingår i: Cortex; a journal devoted to the study of the nervous system and behavior. - 0010-9452. ; 42:3, s. 376-86
  • Tidskriftsartikel (refereegranskat)abstract
    • Androgens have been linked to visuospatial ability. We examined the relationship between serum free testosterone (T) levels and spatial visualization ability in a population-based sample of 450 healthy men between the ages of 35 and 80 years. They were tested on block design and Mini Mental State Examination (MMSE) draw-a-figure, as well as tasks assessing episodic memory, semantic memory, procedural memory, and verbal fluency. Blood was analyzed for free T and estradiol. Participants were grouped into high or low free T based on age-specific median values. Participants with low free T performed at a superior level on both the block design task and draw-a-figure task as compared to participants with high free T. The results are discussed within the scant body of research on androgens and cognition in men.
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2.
  • Yonker, Julie E, et al. (författare)
  • Sex differences in episodic memory: minimal influence of estradiol.
  • 2003
  • Ingår i: Brain and cognition. - 0278-2626. ; 52:2, s. 231-8
  • Tidskriftsartikel (refereegranskat)abstract
    • Sex differences exist for several cognitive tasks and estrogen has been suggested to influence these differences. Eighteen men and 18 women were matched on age and estradiol level. Potential sex differences were assessed in episodic memory, semantic memory, verbal fluency, problem solving, and visuospatial ability. Significant sex differences, favoring women, were found for tasks assessing episodic memory. Correlations between estradiol level and cognitive performance were significant for face recognition in females. Since sex differences remained in verbal episodic memory tasks and face recognition despite matched levels of estradiol, circulating estradiol does not appear to be of paramount consequence for observed sex differences in episodic memory.
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3.
  • Yonker, Julie E, et al. (författare)
  • Sex Differences in Spatial Visualization and Episodic Memory as a Function of Alcohol Consumption.
  • 2005
  • Ingår i: Alcohol and Alcoholism. - 0735-0414. ; 40:3, s. 201-207
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims: Sex differences in visuospatial ability as well as episodic memory have been reliably demonstrated, irrespective of alcoholism. Studies in alcoholics have consistently documented cognitive deficits in visuospatial ability, problem solving and memory function. This cross-sectional, population-based study examined if sex differences in cognitive performance could be impacted by alcohol consumption. Methods: Drinking data were collected from 2224 randomly sampled adults, aged between 35 and 85 years, who participated in the Betula study on memory, health and aging. Participants were classified into non-, light, moderate and heavy drinking subgroups based on sex-adjusted normative values. Cognitive tasks demonstrating clear sex differences, such as episodic memory tasks (favouring women) and spatial visualization tasks (favouring men), were conducted and performance was assessed by sex and the" drinking group. Results: After controlling for age and education, overall analyses found expected sex differences in episodic memory and spatial visualization that were apparent across the entire population. When these sex differences were examined by drinking group, visuospatial performance favouring men disappeared for the moderate to heavy drinking groups, but higher performance by women on episodic memory tasks was consistent across all levels of alcohol consumption. Traditional biomarkers of increased alcohol consumption (GOT and MCV) correlated with the reported drinks/day. Conclusions: These results lend support to the theory that moderate alcohol intake may be beneficial to cognitive function in women, but not necessarily in men.
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4.
  • Yonker, Julie E, et al. (författare)
  • Verified hormone therapy improves episodic memory performance in healthy postmenopausal women.
  • 2006
  • Ingår i: Neuropsychology, development, and cognition. Section B, Aging, neuropsychology and cognition. - Hove : Psychology Press. - 1382-5585 .- 1744-4128. ; 13:3-4, s. 291-307
  • Tidskriftsartikel (refereegranskat)abstract
    • Studies of hormone therapy (HT) and cognition have yielded conflicting results. The aim of this observational study was to examine the effect of estradiol, via serum verified HT (estradiol, estriol, progesterone) and endogenous estradiol, on 108 healthy postmenopausal women's cognitive performance. The results demonstrated that the 43 HT-users performed at a significantly higher level than non-users on episodic memory tasks and on a verbal fluency task, whereas HT-users and non-users did not differ on tasks assessing semantic memory and spatial visualization. In addition, there was a positive relationship between serum estradiol level and episodic memory performance, indicating that postmenopausal HT is associated with enhanced episodic memory and verbal fluency, independent of age and education. These observational results suggest that HT use may be sufficient to exert small, yet positive effects on female sensitive cognitive tasks. Hormone therapy compliance and formulation is discussed as confounding factors in previous research.
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