Browsing by Author "Arriagada Tarifeño, David Andrés"

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    Understanding dual task performance in humans : electrophysiological correlates of interferences and costs between motor and working memory tasks at different levels of workload
    (2019) Arriagada Tarifeño, David Andrés; Ossandón, Tomás; Pontificia Universidad Católica de Chile. Facultad de Medicina
    The simultaneous execution of two different tasks is associated with interference processes that produce a decrease in the performance of one or both duties, a common phenomenon whose neural mechanisms are not yet understood. We recorded electroencephalographic activity (EEG) during cognitive-motor interference in 24 subjects, using a working memory N-back task concurrent with a finger movement both tests were performed on 3 different workloads (easy, medium and hard) resulting in 9 dual tasks of different difficulty levels. A time-frequency analysis of the EEG showed a midline decrease of theta band activity and an increase of alpha band activity when both tasks progressed to a motor workload medium level. The current study shows the development of an opposing oscillatory pattern of alpha and theta, which can be linked to the interferential effects of cognitive-motor task, determining the fall in the overall performance of the test. These effects are only a product of the increase in the difficulty of the motor task.The simultaneous execution of two different tasks is associated with interference processes that produce a decrease in the performance of one or both duties, a common phenomenon whose neural mechanisms are not yet understood. We recorded electroencephalographic activity (EEG) during cognitive-motor interference in 24 subjects, using a working memory N-back task concurrent with a finger movement both tests were performed on 3 different workloads (easy, medium and hard) resulting in 9 dual tasks of different difficulty levels. A time-frequency analysis of the EEG showed a midline decrease of theta band activity and an increase of alpha band activity when both tasks progressed to a motor workload medium level. The current study shows the development of an opposing oscillatory pattern of alpha and theta, which can be linked to the interferential effects of cognitive-motor task, determining the fall in the overall performance of the test. These effects are only a product of the increase in the difficulty of the motor task.The simultaneous execution of two different tasks is associated with interference processes that produce a decrease in the performance of one or both duties, a common phenomenon whose neural mechanisms are not yet understood. We recorded electroencephalographic activity (EEG) during cognitive-motor interference in 24 subjects, using a working memory N-back task concurrent with a finger movement both tests were performed on 3 different workloads (easy, medium and hard) resulting in 9 dual tasks of different difficulty levels. A time-frequency analysis of the EEG showed a midline decrease of theta band activity and an increase of alpha band activity when both tasks progressed to a motor workload medium level. The current study shows the development of an opposing oscillatory pattern of alpha and theta, which can be linked to the interferential effects of cognitive-motor task, determining the fall in the overall performance of the test. These effects are only a product of the increase in the difficulty of the motor task.