The phrase alert state is used in more than one professional discipline.
The phrase alert state is used in milieu variously, although in a capitalized form the reference is of an indication of the state of readiness of the armed forces for military action or a State against terrorism or military attack. The term frequently used is on High Alert  Examples are the DEFCON levels of the US armed forces, probably indicating some degree within DEFCON:2 to DEFCON:4, possibly DEFCON:1 classified with the words as high alert.
The British government's UK Threat Levels, probably including the highest three levels of five, these being classified as substantial, severe and critical. Both highest positions within the classification are synonymous with red alert. All these rely on an understanding of the word alert, which is also originally relevant to a type of military activity, within the earliest recorded usage.
In the context of the Mental status examination, the state of consciousness of an alert person is classified apart from either lethargic or hyper-alert, elsewhere an alert person is capable of providing the correct information when asked their name, their present location and the date, or otherwise is able to talk normally. Altogether the relaxed and alert state of mind of the meditator is scientifically classified as brainwaves of the alpha and beta description respectively. The beta state that corresponds to the prior description is, in fact, within the range of 12 to 15 Hz (& 15–19 Hz).
- Combat readiness
- Homeland Security Advisory System
- Torino scale
- U.S. Military on 'High Alert' [Retrieved 2013 April 12]
- R. van Dijk Encyclopedia of the Cold War, Volume 1
- Home Office Terrorism and national emergencies [Retrieved 2013 April 12] Archived 2013-07-29 at the Wayback Machine.
- Douglas Harper Online Etymology Dictionary: alert [Retrieved 2013 April 12]
- Psychiatry Clerkship [Retrieved 2013 April 12]
- R. Elling, K. M. Elling Principles of patient assessment in EMS [Retrieved 2011-12-28]
- The Initial Assessment [Retrieved 2013 April 12]
- R. Jevning, R.K. Wallace, M. Beidebach The physiology of meditation: A review. A wakeful hypometabolic integrated response Neuroscience & Biobehavioral Reviews Volume 16, Issue 3, Autumn 1992, Pages 415-424 doi:10.1016/S0149-7634(05)80210-6 [Retrieved 2011-12-28]
- N. Herrmann books.google The whole brain business book (334 pages) McGraw-Hill Professional ISBN 0-07-028462-8 [Retrieved 2011-12-28]
- J. Robbins scholar.googleusercontent Wired for miracles?[permanent dead link] page 4, Psychology Today, May/Jun 98 [Retrieved 2011-12-28][dead link]
- earth-issues.com [Retrieved 2011-12-28] Archived 2012-04-26 at the Wayback Machine.
- thejakartapost [Retrieved 2011-12-28] Archived 2012-01-18 at the Wayback Machine.
- World Health Organization - apps.who.int [Retrieved 2011-12-28] Archived July 26, 2010, at the Wayback Machine.
- Commission Electrotechnique Internationale Operating states of electric power systems [Retrieved 2013 April 12]