Consciousness Biology 102 Presented by: Olivia Bianco Taylor Martin Tyler McMillan Courtney Neal Brandon Remmert
Consciousness • Awareness of self and environment
Minimally Conscious State • A condition of severely altered consciousness in which the person demonstrates minimal but definite behavioral evidence of self or environmental awareness • Inconsistent erratic responsiveness and spontaneous eye opening and sleep-wake cycles.
Vegetative State • Vegetative state is caused as a result of severe injury to the upper part of the brain. • A person in a vegetative state may seem to be awake and reflex responses may remain, but they have no awareness of their surroundings and are incapable of feeling mental distress or physical pain. • Causes of brain damage that can lead to vegetative state are either traumatic or non-traumatic. • Recovery from vegetative state depends on how severe the damage to the brain is.
General Anesthetic • A drug that brings about a reversible loss of consciousness • Can be administered through injections or gases and vapors • Three alternate forms of anesthetisa: • Local • Regional • Sedation • Waking up differs on the anesthetic administered (Big Bullet) • Anesthetics are extremely safe due to modern monitors, better drugs, and the training of modern anesthesiologists (Big Bullet)
Comatose • In a comatose state, patients are unable to respond to light or pain. • The comatose state can be brought on by sudden trauma or can be induced by • pharmaceuticals to prevent swelling of the brain which could cause further brain • Damage • The damage to the brain which causes a coma typically occurs in the “midbrain”, • The area of the brain which regulates sleep. Image Courtesy:http://z.about.com/d/psychology/1/0/E/midbrain.jpg
Comatose (contd.) • Comas can last anywhere from a few days to several years. • Patients in Comas can fully recover from the coma, but other times comas progress to brain death.
Brain Death • A term which came about as advancements in medical technologies allowed for people to be kept alive with heart/ lung bypass etc. • Refers to those who no longer have a functioning brain, regardless of the state of the rest of their body • Brain death is determined by a lack of response to numerous stimulants.
Sources http://www.nhsdirect.nhs.uk/articles/article.aspx?articleId=426 http://en.wikipedia.org/wiki/General_anaesthetic http://www.oyston.com/ptinfo/patientga.htm http://www.kurzweilai.net/articles/art0161.html?printable=1