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Event related aspects of somatosensory and auditory evoked potentials: Noise or signals?
| Content Provider | Scilit |
|---|---|
| Author | Stowell, Hilton |
| Copyright Year | 1985 |
| Description | Journal: International Journal of Neuroscience |
| Abstract | The so-called Vertex Potential (VP) of human scalp-conducted and event related brain potential (ERBP), which occur as a slow and often large, biphasic sinusoid within the 100-400 msec time segment after transient stimulation in the three main sensory modalities, are the longest researched of all human evoked potential (EP) phenomena. Its variable amplitude has been directly correlated, in experiments expressly tailored for the purpose, with input/output variables such as the rate of acceleration of given stimulus parameters from a state of relative rest (RM function), interstimulus interval (ISI), stimulus intensity, skin potential and resistance changes (SPR and SRR), the peripheral electroneurogram (ENG), and experimentally isolated C-fiber afference; and with neuropsychological variables such as attention or vigilance, visual acuity, response time, subjective stimulus probability or expectancy, acute pain of both fast and slow kinds, intelligence quotient (IQ), and psychometric personality scores (e.g., extraversion versus introversion and neuroticism versus normality). Unfortunately, the cerebral, neural origins of the VP, if any, are unknown; it is reported as usually absent from cortex-surface EP in those primates and mammals hitherto studied, and also from human extracranial event related magnetic fields of the brain (ERMFb) insofar as these reveal only superficial tangential sources; but a possible analog has been recorded from deep subcortical electrodes during human neurosurgery. In view of the increasing published range and quantity of direct correlates of VP amplitude, and of the scarcity of data about its neuroanatomy and neurophysiology, it seemed a good idea to do some rudimentary signal analysis. Preliminary results from five subjects confirm earlier data: The VP of somatosensory (SEP) and auditory (AEP) evoked potentials, as obtained by scalp-conductance and either averaged or single-epoch, can be resolved into inconsistently stimulus synchronized frequency components which are also present as relatively unsynchronized waves in the theta and alpha bands (approx. 2-13 Hz) of the unstimulated or near-threshold-stimulated electroencephalogram (EEG). In averages of numerous single trials (20 |
| Related Links | http://www.tandfonline.com/doi/pdf/10.3109/00207458508985619 |
| Ending Page | 237 |
| Page Count | 13 |
| Starting Page | 225 |
| ISSN | 00207454 |
| e-ISSN | 15435245 |
| DOI | 10.3109/00207458508985619 |
| Journal | International Journal of Neuroscience |
| Issue Number | 3-4 |
| Volume Number | 26 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 1985-01-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: International Journal of Neuroscience Neurosciences Evoked Potentials Somatosensory Auditory Evoked Event Related Aspects |
| Content Type | Text |
| Subject | Neuroscience Medicine |
