consciousness n.
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  1. Consciousness Biology 102 Presented by: Olivia Bianco Taylor Martin Tyler McMillan Courtney Neal Brandon Remmert

  2. The Stages of Consciousness

  3. Consciousness • Awareness of self and environment

  4. The Stages of Consciousness

  5. 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.

  6. The Stages of Consciousness

  7. 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.

  8. The Stages of Consciousness

  9. 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)

  10. The Stages of Consciousness

  11. 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:

  12. 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.

  13. The Stages of Consciousness

  14. 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.

  15. Sources