The Significance Of The Phi Rhythm - PubMed

Clipboard, Search History, and several other advanced features are temporarily unavailable. Skip to main page content

The .gov means it’s official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation Search: Search Advanced Clipboard Save Email Send to

• Clipboard
• My Bibliography
• Collections
• Citation manager

Display options Display options Format Abstract PubMed PMID

Save citation to file

Format: Summary (text) PubMed PMID Abstract (text) CSV Create file Cancel

Email citation

Email address has not been verified. Go to My NCBI account settings to confirm your email and then refresh this page. To: Subject: Body: Format: Summary Summary (text) Abstract Abstract (text) MeSH and other data Send email Cancel

Add to Collections

• Create a new collection
• Add to an existing collection

Name your collection: Name must be less than 100 characters Choose a collection: Unable to load your collection due to an error Please try again Add Cancel

Add to My Bibliography

• My Bibliography

Unable to load your delegates due to an error Please try again Add Cancel

Your saved search

Name of saved search: Search terms: Test search terms Would you like email updates of new search results? Saved Search Alert Radio Buttons

• Yes
• No

Email: (change) Frequency: Monthly Weekly Daily Which day? The first Sunday The first Monday The first Tuesday The first Wednesday The first Thursday The first Friday The first Saturday The first day The first weekday Which day? Sunday Monday Tuesday Wednesday Thursday Friday Saturday Report format: Summary Summary (text) Abstract Abstract (text) PubMed Send at most: 1 item 5 items 10 items 20 items 50 items 100 items 200 items Send even when there aren't any new results Optional text in email: Save Cancel

Create a file for external citation management software

Create file Cancel

Your RSS Feed

Name of RSS Feed: Number of items displayed: 5 10 15 20 50 100 Create RSS Cancel RSS Link Copy

Actions

CiteCollectionsAdd to Collections

• Create a new collection
• Add to an existing collection

Name your collection: Name must be less than 100 characters Choose a collection: Unable to load your collection due to an errorPlease try again Add Cancel PermalinkPermalinkCopyDisplay options Display options Format AbstractPubMedPMID

Page navigation

• Title & authors
• Abstract
• MeSH terms
• LinkOut - more resources

Title & authors Abstract MeSH terms LinkOut - more resources CiteDisplay options Display options Format AbstractPubMedPMID

Abstract

We reviewed two series of patients with the phi rhythm (posterior rhythmic slow waves occurring after eye closure) to determine its characteristics and clinical significance. Phi rhythm was defined as a minimum of three consecutive monomorphic posterior delta waves occurring within 2 sec of eye closure on at least two occasions during electroencephalography. Group 1 consisted of 30 patients (16 male and 14 female) with a mean age of 11.6 +/- 8.4 years (range, 3 to 46 years) who were evaluated between 1978 and 1993. Phi rhythm most commonly occurred when the patient was alert and after concentrated visual attention, such as reading or picture or pattern scanning. Seventeen of these patients had epilepsy (11 generalized, 3 focal, 1 both, and 2 unclassified). The frequency of epilepsy was not significantly different from that of a control group of 60 patients matched for age and sex; however, generalized epilepsies were more common in the phi group (P = 0.008). Group 2 consisted of a previously unreported series of 121 patients evaluated between 1960 and 1962. A diverse range of underlying clinical diagnoses was evident in both groups. The mechanism of the phi rhythm is unknown, but the findings suggest that the origin is subcortical and that the presence of this activity should not be considered diagnostic of a seizure disorder.

PubMed Disclaimer

MeSH terms

• Adolescent Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Adult Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Aged Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Brain / physiopathology* Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Child Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Child, Preschool Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Electroencephalography Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Epilepsy / physiopathology* Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Female Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Humans Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Male Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search
• Middle Aged Actions
  • Search in PubMed
  • Search in MeSH
  • Add to Search

LinkOut - more resources

• Full Text Sources

  • Elsevier Science

• Medical

  • MedlinePlus Consumer Health Information
  • MedlinePlus Health Information

[x] Cite Copy Download .nbib .nbib Format: AMA APA MLA NLM Send To

• Clipboard
• Email
• Save
• My Bibliography
• Collections
• Citation Manager

[x]

NCBI Literature Resources

MeSH PMC Bookshelf Disclaimer

The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). Unauthorized use of these marks is strictly prohibited.