PHS 3341 Lecture 11: CNS 8 - Rewritten
7 Dec 2016
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Document Summary
Consciousness refers to subjective awareness of the external world and self. States of consciousness in decreasing order of arousal level: To maintain this, you must have the cerebral cortex and the ras functioning. Barbiturates mimic gaba and directly activate gaba receptors and depress the. Ras activates the thalamus, the mid brain and maintains our sate of consciousness. Compression of the brain stem may compress the ras. Sleep is initiated by the brain and performs functions beneficial to the brain. Not accompanied by a reduction in neural activity. Leading theories of why we need sleep are restoration, recovery and memory consolidation. Allows brain to rest and remodel synaptic contacts within the cerebral cortex. Alternating between slow wave sleep and paradoxical (rem) sleep. Slow wave sleep is characterized by slow waves on the eeg. Little change in brain behaviour pattern from the waking state except for not being conscious.
