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Autonomic and electrocortical indice...

Brock University (Canada).

Autonomic and electrocortical indices of performance monitoring and source memory discrimination in older and younger adults.

紀錄類型:	書目-電子資源 : 單行本
正題名/作者:	Autonomic and electrocortical indices of performance monitoring and source memory discrimination in older and younger adults./
作者:	Mathewson, Karen Janet.
面頁冊數:	226 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5885.
Contained By:	Dissertation Abstracts International70-09B.
標題:	Gerontology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR51940
ISBN:	9780494519400

Autonomic and electrocortical indices of performance monitoring and source memory discrimination in older and younger adults.
Mathewson, Karen Janet.

Autonomic and electrocortical indices of performance monitoring and source memory discrimination in older and younger adults. - 226 p.

Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5885.

Thesis (Ph.D.)--Brock University (Canada), 2009.

Reduced capacity for executive cognitive function and for the autonomic control of cardiac responsivity are both concomitants of the aging process. These may be linked through their mutual dependence on medial prefrontal function, but the specifics of that linkage have not been well explored. Executive functions associated with medial prefrontal cortex involve various aspects of performance monitoring, whereas centrally mediated autonomic functions can be observed as heart rate variability (HRV), i.e., variability in the length of intervals between heart beats. The focus for this thesis was to examine the degree to which the capacity for phasic autonomic adjustments to heart rate relates to performance monitoring in younger and older adults, using measures of electrocortical and autonomic activity.

ISBN: 9780494519400Subjects--Topical Terms:

168436
Gerontology.

Autonomic and electrocortical indices of performance monitoring and source memory discrimination in older and younger adults.
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520 $a Reduced capacity for executive cognitive function and for the autonomic control of cardiac responsivity are both concomitants of the aging process. These may be linked through their mutual dependence on medial prefrontal function, but the specifics of that linkage have not been well explored. Executive functions associated with medial prefrontal cortex involve various aspects of performance monitoring, whereas centrally mediated autonomic functions can be observed as heart rate variability (HRV), i.e., variability in the length of intervals between heart beats. The focus for this thesis was to examine the degree to which the capacity for phasic autonomic adjustments to heart rate relates to performance monitoring in younger and older adults, using measures of electrocortical and autonomic activity.
520 $a Behavioural performance and attention allocation during two age-sensitive tasks could be predicted by various aspects of autonomic control. For young adults, greater influence of the parasympathetic system on HRV was beneficial for learning unfamiliar maze paths; for older adults, greater sympathetic influence was detrimental to these functions. Further, these relationships were primarily evoked when the task required the construction and use of internalized representations of mazes rather than passive responses to feedback. When memory for source was required, older adults made three times as many source errors as young adults. However, greater parasympathetic influence on HRV in the older group was conducive to avoiding source errors and to reduced electrocortical responses to irrelevant information. Higher sympathetic predominance, in contrast, was associated with higher rates of source error and greater electrocortical responses to non-target information in both groups. These relations were not seen for errors associated with a speeded perceptual task, irrespective of its difficulty level. Overall, autonomic modulation of cardiac activity was associated with higher levels of performance monitoring, but differentially across tasks and age groups. With respect to age, those older adults who had maintained higher levels of autonomic cardiac regulation appeared to have also maintained higher levels of executive control over task performance.
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