Talk:Evoked potential

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[edit] Introductory sentence

Similar to the discussion in Talk:Visual_evoked_potential, can the "In neurophysiology" phrase be removed from the opening sentence? Edwardian 04:18, 7 August 2005 (UTC)

Yes. Whether neurophysiology or not, an evoked potential is always the same thing. Dontaskme 22:52, 12 September 2005 (UTC)

Good argument. No protests. I'll do it. Lova Falk (talk) 19:52, 14 May 2008 (UTC)

[edit] EEG includes EPs

The article currently suggests that EEG and evoked potentials are completely unrelated. My understanding is that evoked potentials are a component of the EEG. In other words, the EEG is a mix of (a) the evoked potential, (b) spontaneous/ongoing/"background" activity, (c) misc. other things, (d) possibly interactions between the aforementioned components. The article should at least reflect that the EP is a part of the EEG. Dontaskme 22:49, 12 September 2005 (UTC)

Both components are in the EEG, if you mean the actual voltages on the skalp, but the displayed measement results are distinct: You (usually) can't see the EP in a display of EEG traces as it is so much smaller, and you can't see the (background) EEG in an EP display as it averages out. I'll try to clarify this in the article. --Pjacobi 08:17, 13 September 2005 (UTC)
I meant exactly what you are saying. An EP usually cannot be identified in an EEG trace, but it's nevertheless hidden in there (and can be extracted through averaging of multiple trials). Dontaskme 18:41, 13 September 2005 (UTC)
I appreciate the talk, but you should write info in the article, not in the talk page. Yoiu17 06:41, 13 December 2006 (UTC)

[edit] Evoked Potential Synonymous with Event-Related Potential

According to Steven Luck (MIT Press 2005), and also just about everyone else who writes on this, "evoked potential" is just an outdated term for event-related potential (ERP). The two articles should therefore be merged. The article on wikipedia is out of step currently with widely-used terminology as it suggests that evoked potentials differ from ERPs in that they are sensory and stimulus-linked. This is what is commonly called an "exogenous" ERP, where as an endogenous ERP is one that depends more on organism factors than on environment factors.

In a sense, EPs and ERPs are the same thing, though "endogenous," long-latency components (used in cognitive studies) are usually referred to by the term "ERP," while "exogenous," short-/mid-latency VEPs, AEPs/BEARs and SSEPs (used to test the functional integrity of sensory systems) are always referred to as "EPs." "ERPs" often get referred to as "EPs," while I don't think anyone would call a VEP an "ERP." (I.e., I don't think anyone would say, "I just sent my patient to get a visual event-related potential to rule-out optic neuritis," while a cognitive research might in fact say, "I used to do fMRI, but now I am getting into evoked potentials.") Luck's book doesn't address those things which are called "EPs." (For that, see Fisch and Spehlmann's EP Primer or Chiappa's EP in Clinical Medicine.) I don't have a strong opinion about merging the articles, but I just wanted to share my perspective on the semantics. Shwmtpf 07:01, 30 August 2007 (UTC)

Certainly anyone searching should/would use event related potential as term? —Preceding unsigned comment added by Drrjagger (talk • contribs) 18:18, 27 February 2008 (UTC)

No, anyone searching can find the term evoked potential in a text (I did) and wonder what it is. However, that's not an argument for keeping two articles, because evoked potential could easily be redirected to event-related potential. Lova Falk (talk) 13:10, 19 April 2008 (UTC)

Just a brief comment: "evoked" is also opposed to "induced" in the field of EEG and MEG research. Induced is generally used for neuroelectric activity that is not phase-locked to a stimulus but still time-locked to it so that it may be seen by averaging the envelope of filtered EEG/MEG but not in the average of the signals themselves. cf. http://kurage.nimh.nih.gov/meglab/Meg/InducedEvoked knd (talk) 23:01, 8 May 2008 (UTC)

  • After having done some thinking, I'm in favor for merging these articles, especially if in the new article the ways in which EPs and ERPs are the same and are different are pointed out, because that would lead to a greater clarity. Lova Falk (talk) 19:45, 14 May 2008 (UTC)

[edit] Subtopics with separate pages

I think there are links to several pages with subtopics that possibly do not merit their own pages until expanded sufficiently. Kpmiyapuram 13:51, 29 August 2007 (UTC)

I do not agree that the two pages be merged. Evoked potentials include measuring EMG (peripheral muscle response) whereas ERPs are limited to measuring brain responses. Hdesousa (talk) 22:18, 2 February 2008 (UTC) Hansel de Sousa