Specific EEG frequencies signal general common cognitive processes as well as specific task processes in man.

The EEG of 10 normal male young adults was recorded during the performance of three different tasks: mental calculation, verbal working memory (VWM) and spatial working memory (SWM). The stimuli used in the three tasks were the same, only the instructions to the subjects were different. Narrow band analysis of the EEG and distributed sources for each EEG frequency were calculated using variable resolution electromagnetic tomography (VARETA). At some frequencies (1.56, 4.68, 7.80 to 10.92 Hz) at least two tasks produced similar EEG patterns that were interpreted as the reflex of common cognitive processes, such as attention, inhibition of irrelevant stimuli, etc. Specific changes were also observed at 2.34, 3.12, 3.90, 5.46 and 6.24 Hz. The first three of these frequencies showed similar changes during VWM and calculus at the left frontal cortex, suggesting the activation of working memory (WM) processes. The interaction effect at these frequencies was mainly observed at the anterior cingulate cortex and frontal cortex. At 5.46 and 6.24 Hz, changes were only observed during mental calculation.

[1]  T. Kakizaki,et al.  Relationship between EEG amplitude and subjective rating of task strain during performance of a calculating task , 2004, European Journal of Applied Physiology and Occupational Physiology.

[2]  Jorge J. Riera,et al.  Frequency Domain Distributed Inverse Solutions , 2000 .

[3]  D. Collins,et al.  Automatic 3D Intersubject Registration of MR Volumetric Data in Standardized Talairach Space , 1994, Journal of computer assisted tomography.

[4]  Christoph Mulert,et al.  The relationship between reaction time, error rate and anterior cingulate cortex activity. , 2003, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[5]  T. Fernández,et al.  Cerebral blood flow and sources of abnormal EEG activity (VARETA) in neurocysticercosis , 2001, Clinical Neurophysiology.

[6]  M. McCloskey.  Cognitive mechanisms in numerical processing: Evidence from acquired dyscalculia , 1992, Cognition.

[7]  M. Scherg,et al.  Two bilateral sources of the late AEP as identified by a spatio-temporal dipole model. , 1985, Electroencephalography and clinical neurophysiology.

[8]  A. Rodríguez,et al.  El cerebro en acción , 1976 .

[9]  Eduardo Aubert,et al.  Sources of Abnormal EEG Activity in Spontaneous Intracerebral Hemorrhage , 2002, Clinical EEG.

[10]  N. Trujillo-Barreto,et al.  3D Statistical Parametric Mapping of EEG Source Spectra by Means of Variable Resolution Electromagnetic Tomography (VARETA) , 2001, Clinical EEG.

[11]  T. Fernández,et al.  EEG delta activity: an indicator of attention to internal processing during performance of mental tasks. , 1996, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[12]  T. Fernández,et al.  Sources of Abnormal EEG Activity in the Presence of Brain Lesions , 1999, Clinical EEG.

[13]  M M Mesulam,et al.  Large‐scale neurocognitive networks and distributed processing for attention, language, and memory , 1990, Annals of neurology.

[14]  Terry M. Peters,et al.  3D statistical neuroanatomical models from 305 MRI volumes , 1993, 1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference.

[15]  Michael I. Posner,et al.  Structures and Functions of Selective Attention. , 1987 .

[16]  Karl J. Friston,et al.  A unified statistical approach for determining significant signals in images of cerebral activation , 1996, Human brain mapping.

[17]  M. Corsi-Cabrera,et al.  EEG activity during performance of cognitive tasks demanding verbal and/or spatial processing. , 1988, The International journal of neuroscience.

[18]  T. Fernández,et al.  Sources of Abnormal EEG Activity in Brain Infarctions , 2000, Clinical EEG.

[19]  Arthur W. Toga,et al.  A Probabilistic Atlas of the Human Brain: Theory and Rationale for Its Development The International Consortium for Brain Mapping (ICBM) , 1995, NeuroImage.

[20]  E. John,et al.  Localization of Deep White Matter Lymphoma Using VARETA: A Case Study , 2001, Clinical EEG.

[21]  E. Adrian,et al.  THE BERGER RHYTHM: POTENTIAL CHANGES FROM THE OCCIPITAL LOBES IN MAN , 1934 .

[22]  D M Tucker,et al.  Regional changes in EEG power and coherence during cognition: intensive study of two individuals. , 1985, Behavioral neuroscience.

[23]  W. Klimesch.  EEG alpha and theta oscillations reflect cognitive and memory performance: a review and analysis , 1999, Brain Research Reviews.

[24]  Juan Silva-Pereyra,et al.  EEG changes during word and figure categorization , 2001, Clinical Neurophysiology.

[25]  A. Nambu,et al.  Studies on integrative functions of the human frontal association cortex with MEG. , 1996, Brain research. Cognitive brain research.

[26]  G. Dolce,et al.  Spectral and multivariate analysis of EEG changes during mental activity in man. , 1974, Electroencephalography and clinical neurophysiology.

[27]  J. C. Crowell.  First International Symposium on Antarctic Geology , 1966 .

[28]  Daphne N. Yu,et al.  High-resolution EEG mapping of cortical activation related to working memory: effects of task difficulty, type of processing, and practice. , 1997, Cerebral cortex.

[29]  T. Fernández,et al.  EEG activation patterns during the performance of tasks involving different components of mental calculation. , 1995, Electroencephalography and clinical neurophysiology.

[30]  G. Hitch.  The role of short-term working memory in mental arithmetic , 1978, Cognitive Psychology.

[31]  E. Warrington,et al.  Cognitive Neuropsychology: A Clinical Introduction , 1990 .

[32]  J. Arruda,et al.  Comparison of QEEG and response accuracy in good vs poorer performers during a vigilance task. , 1993, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[33]  S. Sternberg.  High-Speed Scanning in Human Memory , 1966, Science.

[34]  D. Lehmann,et al.  Low resolution electromagnetic tomography: a new method for localizing electrical activity in the brain. , 1994, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[35]  Jorge J. Riera,et al.  Spatio Temporal Distributed Inverse Solutions , 2000 .

[36]  Jorge Bosch,et al.  Do specific EEG frequencies indicate different processes during mental calculation? , 1999, Neuroscience Letters.

[37]  Edward E. Smith,et al.  The architecture of working memory , 1997 .

[38]  O D Creutzfeldt,et al.  EEG changes during performance of various tasks under open- and closed-eye conditions. , 1969, Electroencephalography and clinical neurophysiology.

[39]  Pierre Etevenon,et al.  6 – Applications and Perspectives of EEG Cartography , 1986 .