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13 Cards in this Set
- Front
- Back
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waves of current passing through ECF can be measured how? |
voltage changes on the skin using an electroencephalogram |
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alpha rhythm during sleep |
relaxed state of awareness, eyes are closed but you are still aware |
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beta rhythm |
eyes closed but consciously alert |
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control of sleep/wake cycle - basic rhythm + influence of light |
controlled in the suprachiamatic nucleus of the hypothalamus - intrinsic cycle reset by retinal input light is important - left in the dark all the time our body clocks get out of sync |
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mechanisms of wakefulness - thalamus |
the thalamus allows or disallows sensory input into the conscious experience |
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definition of consciousness |
able to immediately respond to environment |
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how is EEG used to diagnose epilepsy |
detection of abnormal synchronous brain activity |
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stages of sleep and EEG pattern |
awake - desynchronised stage 1 - 4 getting more and more synchronised - bigger amplitude REM sleep - desynchronised - very similar EEG pattern to wakefulness - paradoxical sleep |
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narcolepsy |
hypothalamic neurones release proteins called orexins in the reticular formation which are needed to keep us awake - narcolepsy involves defective orexin neurones |
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schizophrenia - disorder of consciousness --> positive and negative symptoms |
psychosis: positive symptoms - hallucinations, delusions, paranoia negative symptoms - social withdrawl, apathy, catatonia |
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in schizophrenia reality is recreated like in a memory, but we fail to differentiate between what is outside of our head or inside |
ye |
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depression + 2 types |
mood disorder thought to be related to the serotonin system (SSRI drugs) endogenous - no apparent bad life-event, much harder to treat reactive - in response to bad life event |
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bipolar disorder - manic depression |
depression alternates with mania mania - elevated mood, high energy, grandiosity, poor judgment, delusions |
