Purpose: The question of the present study is whether the brain as a system with gradually decreasing
resources maximizes its performance by reorganizing neural networks for greater efficiency.
Material/methods: Auditory event-related low frequency oscillations (delta d – [2, 4] Hz; theta u – [4.5,
7] Hz; alpha a – [7.5, 12] Hz) were examined during an auditory discrimination motor task (lowfrequency
tone – right hand movement, high-frequency tone – left hand movement) between two
groups with mean age 26.3 and 55 years.
Results: The amplitudes ofthe phase-locked d, u and a activity were more pronounced with a progressive
increase in age during the sensory processing, independent of tone type. The difference between the
groups with respect to scalp distribution was tone-independent for delta/theta oscillations, but not for
the alpha activity. Age-related and tone-dependent changes in a band activity were focused at frontal
and sensorimotor areas. Neither functional brain specificity was observed for the amplitudes of the lowfrequency
(d, u, a) oscillations during the cognitive processing, which diminished with increasing age.
Conclusion: The cognitive brain oscillatory specificity diminished with increasing age.
2014 Medical University of Bialystok. Published by Elsevier Urban & Partner Sp. z o.o. All rights
Purpose: The question of the present study is whether the brain as a system with gradually decreasingresources maximizes its performance by reorganizing neural networks for greater efficiency.Material/methods: Auditory event-related low frequency oscillations (delta d – [2, 4] Hz; theta u – [4.5,7] Hz; alpha a – [7.5, 12] Hz) were examined during an auditory discrimination motor task (lowfrequencytone – right hand movement, high-frequency tone – left hand movement) between twogroups with mean age 26.3 and 55 years.Results: The amplitudes ofthe phase-locked d, u and a activity were more pronounced with a progressiveincrease in age during the sensory processing, independent of tone type. The difference between thegroups with respect to scalp distribution was tone-independent for delta/theta oscillations, but not forthe alpha activity. Age-related and tone-dependent changes in a band activity were focused at frontaland sensorimotor areas. Neither functional brain specificity was observed for the amplitudes of the lowfrequency(d, u, a) oscillations during the cognitive processing, which diminished with increasing age.Conclusion: The cognitive brain oscillatory specificity diminished with increasing age. 2014 Medical University of Bialystok. Published by Elsevier Urban & Partner Sp. z o.o. All rights
การแปล กรุณารอสักครู่..
