The reaction time has been described as a measure of perception, decision making, and other cognitive processes. The aim of this work is to examine age‐related changes in executive functions in terms of demand load under varying presentation times. Two tasks were employed where a signal detection and a discrimination task were performed by young and older university students. Furthermore, a characterization of the response time distribution by an ex‐Gaussian fit was carried out. The results indicated that the older participants were slower than the younger ones in signal detection and discrimination. Moreover, the differences between both processes for the older participants were higher, and they also showed a higher distribution average except for the lower and higher presentation time. The results suggest a general slowdown in both tasks for age under different presentation times, except for the cases where presentation times were lower and higher. Moreover, if these parameters are understood to be a reflection of executive functions, these findings are consistent with the common view that age‐related cognitive deficits show a decline in this function. 相似文献
Objective: Chronological age is commonly used to explain change in sleep. The present study examines whether subjective age is associated with change in sleep difficulties across middle adulthood and old age.
Design: Participants were drawn from the second (2004–2005) and third (2013–2014) waves of the Midlife in the United States Survey (MIDUS, N = 2350; Mean Age: 55.54 years), the 2008 and 2014 waves of the Health and Retirement Study (HRS, N = 4066; Mean Age: 67.59 years) and the first (2011) and fourth (2014) waves of the National Health and Aging Trends Survey (NHATS, N = 3541; Mean Age: 76.46). In each sample, subjective age, sleep difficulties, depressive symptoms, anxiety and chronic conditions were assessed at baseline. Sleep difficulties was assessed again at follow-up.
Main outcome measures: Sleep difficulties.
Results: An older subjective age at baseline was related to an increase in sleep difficulties over time in the three samples, and was mediated, in part, through more depressive symptoms, anxiety and chronic conditions. Feeling older was associated with an increased likelihood of major sleeping difficulties at follow-up in the three samples.
Conclusion: Subjective age is a salient marker of individuals’ at risk for poor sleep quality, beyond chronological age. 相似文献
The no, moderate, and large differences between shares of outcome allocated to the high and low performers are interpreted as the respective rules of equality, ordinal equity, and proportional equity. The ability to employ the proportional rule is also believed to develop around the age of 13 years. The authors hypothesized that: (i) the rule of outcome allocation is subtraction; and (ii) age differences in outcome allocation are mediated by age differences in perceived inputs. In an experiment on Chinese aged 8–20 years, measures of perceived inputs were taken after or before outcome allocation. Results from the input-allocation order supported the hypotheses. Obviously, age effects in outcome allocations by Asians can sometimes be mediated by age differences in the ability to perceive the inputs accurately. 相似文献
Acceptance and Commitment Therapy (ACT) and Relational Frame Theory (RFT) are part of the new wave of treatments and analyses
that seem to be emerging in cognitive behavior therapy. In this article, data in support of these new approaches are provided,
and evidence that ACT works through different processes than traditional CBT are presented. The integrative proposals of Ciarrochi
and Robb, and Ciarrochi, Robb, and Godsell are then considered. In the long run, whether such integrations are useful is an
empirical matter, but concerns are raised about the effects of focusing on the content of beliefs, and the role of logical–empirical
challenges to belief.
Address correspondence to Steven C. Hayes, Department of Psychology/298, University of Nevada, Reno, NV 89557-0062, USA. 相似文献
Delta (1–4 Hz) EEG power in non-rapid eye movement (NREM) sleep declines massively during adolescence. This observation stimulated the hypothesis that during adolescence the human brain undergoes an extensive reorganization driven by synaptic elimination. The parallel declines in synaptic density, delta wave amplitude and cortical metabolic rate during adolescence further support this model. These late brain changes probably represent the final ontogenetic manifestation of nature’s strategy for constructing nervous systems: an initial overproduction of neural elements followed by elimination. Errors in adolescent brain reorganization may cause mental illness; this could explain the typical age of onset of schizophrenia. Longitudinal studies of sleep EEG are enhancing our knowledge of adolescent brain maturation. Our longitudinal study of sleep EEG changes in adolescence showed that delta power, which may reflect frontal cortex maturation, begins its decline between ages 11 and 12 years and falls by 65% by age 17 years. In contrast, NREM theta power begins its decline much earlier. Delta and theta EEG frequencies are important to sleep theory because they behave homeostatically. Surprisingly, these brain changes are unrelated to pubertal maturation but are strongly linked to age. In addition to these (and other) maturational EEG changes, sleep schedules in adolescence change in response to a complex interaction of circadian, social and other influences. Our data demonstrate that the daytime sleepiness that emerges in adolescence is related to the decline in NREM delta as well as to altered sleep schedules. These longitudinal sleep data provide guideposts for studying cognitive and behavioral correlates of adolescent brain reorganization. 相似文献