J
Juha Virtanen
Researcher at General Electric
Publications - 79
Citations - 4023
Juha Virtanen is an academic researcher from General Electric. The author has contributed to research in topics: Signal & Magnetoencephalography. The author has an hindex of 33, co-authored 78 publications receiving 3907 citations. Previous affiliations of Juha Virtanen include Helsinki University Central Hospital & University of Helsinki.
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Journal ArticleDOI
Separate time behaviors of the temporal and frontal mismatch negativity sources.
Teemu Rinne,Kimmo Alho,Risto J. Ilmoniemi,Juha Virtanen,Juha Virtanen,Risto Näätänen,Risto Näätänen +6 more
TL;DR: The results support the hypothesis that the frontal MMN generator is activated later than the auditory cortex generator.
Journal ArticleDOI
Processing of novel sounds and frequency changes in the human auditory cortex: Magnetoencephalographic recordings
Kimmo Alho,István Winkler,István Winkler,Carles Escera,Minna Huotilainen,Minna Huotilainen,Juha Virtanen,Juha Virtanen,Iiro P. Jääskeläinen,Iiro P. Jääskeläinen,Eero Pekkonen,Eero Pekkonen,Risto J. Ilmoniemi +12 more
TL;DR: Source localization for the MEG counterpart of P3a (P3am) suggested that the auditory cortex in the superior temporal plane is involved in the neural network of involuntary attention switching to changes in the acoustic environment.
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Spatiotemporal activity of a cortical network for processing visual motion revealed by MEG and fMRI.
Seppo P. Ahlfors,G. V. Simpson,Anders M. Dale,John W. Belliveau,A.K. Liu,Antti Korvenoja,Juha Virtanen,Juha Virtanen,Minna Huotilainen,Minna Huotilainen,Roger B. H. Tootell,Hannu J. Aronen,Risto J. Ilmoniemi +12 more
TL;DR: Characteristic patterns of activity are revealed in this cortical network for processing sudden changes in the direction of visual motion in motion sensitive areas of the brain.
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Instrumentation for the measurement of electric brain responses to transcranial magnetic stimulation
TL;DR: In this article, a 60-channel EEG acquisition system was described for the recording of scalppotential distributions starting just 2.5ms after individual transcranial magnetic stimulation (TMS) pulses.
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Effects of interstimulus interval on somatosensory evoked magnetic fields (SEFs): a hypothesis concerning SEF generation at the primary sensorimotor cortex,
Heidi Wikström,Juha Huttunen,Juha Huttunen,Antti Korvenoja,Juha Virtanen,Juha Virtanen,Oili Salonen,Hannu J. Aronen,Risto J. Ilmoniemi +8 more
TL;DR: Based on known effects of the ISI on intracellular evoked potentials, the following tentative model is presented for the generation mechanism of the SMI response: N20m represents early excitatory postsynaptic potentials (EPSPs), P35m early inhibitory post synapses (IPSPs), N45m secondary EPSPs and P60m late IPSPs in pyramidal neurones of area 3b.