Event-related desynchronization (ERD) patterns during memory processes: effects of aging and task difficulty |
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| Affiliation: | 1. LABACOLIL, Université de Lille III, UFR de Psychologie, BP 149, 59653 Villeneuve d''Ascq Cedex, France;2. Département de Neurophysiologie Clinique, CHRU de Lille, Hôpital B, 59037 Lille, France;1. Department of Physiology and Pharmacology, University of Rome “La Sapienza”, Rome, Italy;2. IRCCS S. Raffaele Pisana, Rome, Italy;3. IRCCS Neuromed, Pozzilli, IS, Italy;4. IRCCS SDN, SDN Foundation, Naples, Italy;5. Department of Studies of Institutions and Territorial Systems, University of Naples Parthenope, Naples, Italy;6. Neurology, Catholic University of Sacro Cuore, Rome, Italy;7. Department of Neuroscience, University of Parma, Italy;1. Botswana International University of Science and Technology, Palapye, Botswana;2. Department of Zoology and Entomology, Rhodes University, Makhanda 6140, South Africa;3. Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria 0028, South Africa;4. International Centre of Insect Physiology and Ecology (ICIPE), P.O Box 30772-0 010 0, Nairobi, Kenya;5. Department of Zoology and Entomology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa;6. Tugwi-Mukosi Multidisciplinary Research Institute, Midlands State University, P. Bag 9055, Gweru, Zimbabwe;7. Climate Change Biology Research Group, State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, China;1. Institut de Mathématiques de Toulouse, INSA de Toulouse, Université de Toulouse, France;2. Université Paris-Est, LIGM UMR CNRS 8049, Université Paris-Est Marne-la-Vallée, 5 boulevard Descartes, 77420 Champs-sur-Marne, France;1. Sagol Department of Neurobiology, University of Haifa, Haifa 3498838, Israel;2. Baruch Ivcher School of Psychology, Interdisciplinary Center Herzliya, Herzliya 4610101, Israel;1. University of North Texas, Department of Computer Science and Engineering, 1155 Union Circle #311366, Denton, Texas, 76203;2. University of North Texas, Department of Psychology, 1155 Union Circle # 311280, Denton, Texas, 76203 |
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| Abstract: | Event-related desynchronization (ERD) was studied in 10 young (mean age = 19.1) and 10 older (mean age = 62.8) subjects during two recognition tasks: verbal and visuo-spatial. The difficulty of these tasks varied according to the difficulty to distinguish between targets and distractors. EEGs recorded from 29 electrodes were used to compute ERDs from 14 source derivations in 125 msec intervals. Thereafter, they were displayed as spatio-temporal maps. The results show that desynchronization was more widespread in the visuo-spatial compared to the verbal task. This was observed in the two age groups, although it was more pronounced in the young subjects. The effect of task complexity was also influenced by the kind of material to be remembered: more differences between the two levels of difficulty were observed during the verbal task.The results revealed significant influences of the task and time variables on the ERD patterns. A distinct time course of the desynchronization phenomenon was observed to be related to the kind of recognition task. Age and task complexity interacted with the other variables. |
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