The cerebral origin of the alpha rhythm

Hogan, Kirk; Fitzpatrick, J.

doi:10.1016/0013-4694(88)90037-5

Cited by 11 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Much work has been done to reveal the mechanisms underlying this synchronized, oscillatory firing (Adrian and Yamagiwa, 1935; Freeman, 1975; Hogan and Fitzpatrick, 1988; Lopes Da Silva, 1991; Basar, 1998). Cortico-thalamic loops (Lopes Da Silva et al, 1974; Steriade et al, 1990; Lumer et al, 1997a,b; Hughes and Crunelli, 2005), as well as the interplay between inhibitory interneurons and pyramidal cells (Lytton and Sejnowski, 1991; Cobb et al, 1995; Whittington et al, 1995; Buzsáki, 2006), proved to be crucial factors in this regard.…”

Section: Introductionmentioning

confidence: 99%

Neural synchrony within the motor system: what have we learned so far?

Wijk¹,

Beek²,

Daffertshofer³

2012

Front. Hum. Neurosci.

214

173

View full text Add to dashboard Cite

Synchronization of neural activity is considered essential for information processing in the nervous system. Both local and inter-regional synchronization are omnipresent in different frequency regimes and relate to a variety of behavioral and cognitive functions. Over the years, many studies have sought to elucidate the question how alpha/mu, beta, and gamma synchronization contribute to motor control. Here, we review these studies with the purpose to delineate what they have added to our understanding of the neural control of movement. We highlight important findings regarding oscillations in primary motor cortex, synchronization between cortex and spinal cord, synchronization between cortical regions, as well as abnormal synchronization patterns in a selection of motor dysfunctions. The interpretation of synchronization patterns benefits from combining results of invasive and non-invasive recordings, different data analysis tools, and modeling work. Importantly, although synchronization is deemed to play a vital role, it is not the only mechanism for neural communication. Spike timing and rate coding act together during motor control and should therefore both be accounted for when interpreting movement-related activity.

show abstract

Section: Introductionmentioning

confidence: 99%

Neural synchrony within the motor system: what have we learned so far?

Wijk¹,

Beek²,

Daffertshofer³

2012

Front. Hum. Neurosci.

214

173

View full text Add to dashboard Cite

show abstract

“…Electroencephalography (EEG) measurements may offer a route to the solution of this problem because they directly reflect the activity of neuronal cells 10,11 . Although there is a little debate on the physiological meaning of alpha attenuation, 12 if one considers the fact that EEG alpha activity is suppressed by arousal 13 or activated during tasks, 14 it can be reasonably presumed that lower alpha power reflects higher brain activity 15–17 …”

Section: Introductionmentioning

confidence: 99%

Association between EEG alpha power and visuospatial function in obsessive–compulsive disorder

Shin

Kim

et al. 2003

Psychiatry Clin Neurosci

View full text Add to dashboard Cite

The purpose of the present paper was to determine if frontal activity, measured as electroencephalogram alpha power, correlates with visuospatial functions in obsessive-compulsive disorder (OCD). Electroencephalography and the Rey-Osterrieth Complex Figure Test (RCFT) were performed on 23 patients meeting the Diagnostic and Statistical Manual of Mental Disorders (4th edn; DSM-IV) OCD criteria. After quantitatively analyzing EEG recordings taken over the frontal, temporal, parietal and occipital regions (F1, F2, T3, T4, P3, P4, O1 and O2), the log transformed absolute power values of the alpha frequencies of the regions were regressed with each RCFT index (copy, immediate recall and delayed recall score). On the frontal region (F1, F2), the RCFT copy score was found to be correlated with the alpha power with regression coefficients that had different directions according to hemisphere (F1, 5.62; F2, -5.26). The result that visuo-constructional ability represented by the RCFT copy score correlated with frontal activation as measured by decreased alpha power, supports the opinion that visuospatial dysfunction in OCD is not in the visuospatial memory per se but rather that it is mediated by executive function deficit. The opposite correlation directions indicate that greater left frontal activation correlates with a poorer RCFT copy score and that greater right frontal activation correlates with a better copy score. These relationships provide indirect evidence of the possibility that the main pathology of OCD is located in the left hyperfrontality and that the right hyperfrontality of OCD occurs by a compensatory mechanism.

show abstract

“…The exact origin of the alpha rhythm is not known but this rhythm, like other EEG waves, reflects ionic changes which are dependent on oxydative energy metabolism and active membrane transport [1,7,9,15,19,20]. Our findings show that the power spectrum of the alpha rhythm in the thalassemic patients displayed a signifi cant enhancement (as compared to normals) in most areas of the brain after transfusion.…”

Section: Discussionmentioning

confidence: 55%

The Effect of Blood Transfusion on Alpha EEG Activity in Thalassemic Patients

1991

View full text Add to dashboard Cite

EEG signal analysis could be very helpful in the detection of signs of adverse reaction to the brain by a systemic disease. We performed an EEG spectral analysis in 12 young patients with thalassemia before and after their regular blood transfusion, and in 10 volunteer students. Our aim was to test if the EEG analysis could detect signs of brain dysfunction due to the cerebral hypoxia as a result of the anemia. We analyzed the EEG signals on line using a dedicated computer system estimating the power of the delta, theta, alpha, sigma and beta bands of the EEG. After transfusion, the power spectral density of the alpha band showed a significant enhancement in most areas of the brain, in the group of the thalassemia patients as compared to the normals. These differences correlated with the levels of hemoglobin of the patients, and possibly reflect the degree of oxygenation of the brain. Since the visual interpretation of the EEG is not efficient for estimating the brain dysfunction in the anemic state in thalassemia, the signal analysis of the EEG may provide a more sensitive alternative to study the effects of hypoxia on brain function.

show abstract

The cerebral origin of the alpha rhythm

Cited by 11 publications

References 10 publications

Neural synchrony within the motor system: what have we learned so far?

Neural synchrony within the motor system: what have we learned so far?

Association between EEG alpha power and visuospatial function in obsessive–compulsive disorder

The Effect of Blood Transfusion on Alpha EEG Activity in Thalassemic Patients

Contact Info

Product

Resources

About