EEG delta activity: an indicator of attention to internal processing during performance of mental tasks
| Autor: | Alfonso Reyes, Lourdes Díaz-Comas, Mario H. Rodriguez, Erzsébet Marosi, Thalía Fernández, Jorge Bernal, Miguel Rodríguez, Thalía Harmony, Juan Silva |
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| Rok vydání: | 1996 |
| Předmět: |
Adult
Male medicine.diagnostic_test General Neuroscience Short-term memory Electroencephalography Stimulus (physiology) Mental calculation Alpha Rhythm Mental Processes Neuropsychology and Physiological Psychology Delta Rhythm Eeg activity Physiology (medical) medicine Humans Attention 10-20 system Psychology Evoked Potentials Delta activity Psychomotor Performance Cognitive psychology |
| Zdroj: | International Journal of Psychophysiology. 24:161-171 |
| ISSN: | 0167-8760 |
| DOI: | 10.1016/s0167-8760(96)00053-0 |
| Popis: | In previous papers we proposed that an increase in delta EEG activity during mental tasks might be related to an increase in subjects' attention to internal processing. In this paper we have made a narrow band analysis to detect those EEG frequencies that change selectively during the performance of a mental task that requires attention to internal processing. Two different experiments were performed: 1. (1) a difficult mental calculation task and a control stimulus with the, same physical characteristics as the arithmetical symbols were presented in random order 2. (2) the Sternberg paradigm for the analysis of short term memory using a memory set of 5 or 3 digits was also presented in random order. Referential recordings to linked ears were obtained in all leads of the 10 20 system. In the first experiment, the increase of power from 1.56 to 5.46 Hz was observed only during the performance of the task and not during the control condition. In the Sternberg paradigm, the increase of power from 1.56 to 3.90 Hz was greater during the difficult than during the easy condition. These results support our hypothesis that an increase in delta activity may be related to attention to internal processing during the performance of a mental task. |
| Databáze: | OpenAIRE |
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