Magnetic mu rhythm in man

Tiihonen, Jari; Kajola, M.; Hari, R.

doi:10.1016/0306-4522(89)90299-6

Cited by 132 publications

(70 citation statements)

References 13 publications

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“…This is also what is usually observed in power spectra of the mu rhythm (Hari and Salmelin, 1997). These overtones occasionally lose their phase-locking to the fundamental frequency and instead appear as independent oscillations in the beta band (Pfurtscheller 1981;Tiihonen 1989). Such differences can further complicate the classification and have led different authors to report on the same oscillatory phenomenon with references to mu, alpha and beta rhythm.…”

Section: Cortical Oscillations Involving Large Neuronal Populationssupporting

confidence: 75%

Mechanisms underlying cortical resonant states: implications for levodopa-induced dyskinesia

Richter

Halje

Petersson

2013

Reviews in the Neurosciences

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A common observation in recordings of neuronal activity from the cerebral cortex is that populations of neurons show patterns of synchronized oscillatory activity. However, it has been suggested that neuronal synchronization can, in certain pathological conditions, become excessive and possibly have a pathogenic role. In particular, aberrant oscillatory activation patterns have been implicated in conditions involving cortical dysfunction. We here review the mechanisms thought to be involved in the generation of cortical oscillations and discuss their relevance in relation to a recent finding indicating that high-frequency oscillations in the cerebral cortex have an important role in the generation of levodopa-induced dyskinesia. On the basis of these insights, it is suggested that the identification of physiological changes associated with symptoms of disease is a particularly important first step toward a more rapid development of novel treatment strategies.

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Section: Cortical Oscillations Involving Large Neuronal Populationssupporting

confidence: 75%

Mechanisms underlying cortical resonant states: implications for levodopa-induced dyskinesia

Richter

Halje

Petersson

2013

Reviews in the Neurosciences

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“…This consideration follows in part from qualitative observations of the distinct appearance of mu as an arch-shaped or 'wicket' rhythm [98], which hinted that it might be composed of two different cortical rhythms. This was indeed confirmed by quantitative studies in adults showing the presence of two related rhythms over sensorimotor areas: one at around 10 Hz and the other cycling around 20 Hz, which falls in the beta frequency range [26]. Further work with adults suggested different cortical origins for these two oscillations, with the alpha-range mu rhythm being localized to postcentral somatosensory cortex and the higher frequency beta-range component originating in precentral motor cortex [99].…”

Section: Unpacking the Origins And Meaning Of Mu Rhythm Desynchronizamentioning

confidence: 62%

“…Although the adult mu signal has two frequency components, one centred around 10 Hz and another occurring at around 20 Hz [26], experiments have tended to focus on the lower frequency component, which falls within the alpha frequency range (8)(9)(10)(11)(12)(13) Hz in adults). This alpha-range component of mu is functionally distinct from the classical occipital alpha rhythm that occurs over posterior electrode sites [27].…”

Section: The Sensorimotor Mu Rhythmmentioning

confidence: 99%

Neural mirroring mechanisms and imitation in human infants

Marshall

Meltzoff

2014

Phil. Trans. R. Soc. B

157

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Studying human infants will increase our understanding of the nature, origins and function of neural mirroring mechanisms. Human infants are prolific imitators. Infant imitation indicates observation-execution linkages in the brain prior to language and protracted learning. Investigations of neural aspects of these linkages in human infants have focused on the sensorimotor mu rhythm in the electroencephalogram, which occurs in the alpha frequency range over central electrode sites. Recent results show that the infant mu rhythm is desynchronized during action execution as well as action observation. Current work is elucidating properties of the infant mu rhythm and how it may relate to prelinguistic action processing and social understanding. Here, we consider this neuroscience research in relation to developmental psychological theory, particularly the 'Like-Me' framework, which holds that one of the chief cognitive tasks of the human infant is to map the similarity between self and other. We elucidate the value of integrating neuroscience findings with behavioural studies of infant imitation, and the reciprocal benefit of examining mirroring mechanisms from an ontogenetic perspective.

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“…With intracranial electrodes in the human brain, alpha rhythms could be traced throughout the whole occipital cortex (Perez-Borja et al, 1962). With respect to the mu rhythm there are source models showing dipolar sources located in the somatosensory cortex (Tiihonen et al, 1989, Salmelin and Hari, 1994, Hari et al, 1997 that correspond well to results of corticograhic recordings (Arroyo et al, 1993, Crone et al, 1998. Our objectives were to determine the distribution of the estimated sources of sleep spindles, and alpha and mu rhythms based on whole-head MEG (and EEG) recordings obtained from the same subjects by using a dipole fit algorithm which has the capacity to calculate sources of large amounts of data.…”

Section: Introductionmentioning

confidence: 99%