Sleep & Biological Rhythms

Zaneta Chan
Mind Map by Zaneta Chan, updated more than 1 year ago
Zaneta Chan
Created by Zaneta Chan about 4 years ago


. Biopsychology Mind Map on Sleep & Biological Rhythms, created by Zaneta Chan on 03/26/2016.

Resource summary

Sleep & Biological Rhythms
1 Stages of Sleep
1.1 Stage 1
1.1.1 Light sleep, irregular low voltage waves
1.2 Stage 2
1.2.1 Sleep Spindle Short bursts of 12-14Hz waves
1.2.2 K-Complex Sharp high amplitude negative waves, smaller slow positive waves
1.3 Stage 3 & 4
1.3.1 Slow, large amplitude waves
1.3.2 Deepest sleep
1.4 REM Sleep
1.4.1 Function Discards useless connections formed in the day Assists in memory formation & motor skills Moving eyes increase O2 supply to cornea Irritability, anxiety, impaired concentration Rats die from no REM sleep
1.4.2 Desynchronized EEG activity
1.4.3 Rapid eye movements
1.4.4 Muscular paralysis
1.4.5 REM Rebound
1.5 1 Cycle = 90mins
2 Brain Activity
2.1 Measurements
2.1.1 EEG Electroencephalograph measures electrical potentials by synchronicity net avg of all neuron activity
2.1.2 EMG Electromyogram electrical potential recorded from electrode placed on muscle detects muscle movement
2.1.3 EOG Electro-oculogram electrical potential recorded from electrode placed around eye detects eye movements REM Sleep
2.2 Alpha
2.2.1 Relaxation Smooth, 8-12Hz
2.3 Beta
2.3.1 Arousal Fairly slow, 13-30Hz
2.4 Theta
2.4.1 Stage 1 & REM 3.5-7.5 Hz
2.5 Delta
2.5.1 Stage 3 & 4 Less than 4Hz
3 Wakefulness & Arousal
3.1 Neurotransmitters
3.1.1 ACh Key player, keeps you awake but triggers REM Pons & Basal Forebrain produce activation & cortical desynchrony Faster REM
3.1.2 NE Keeps you awake Catecholamine agonists produce arousal & sleeplessness Locus Coeruleus in dorsal pons
3.1.3 5-HT Activates Behavior Raphe Nuclei NE & 5HT disrupts REM
3.2 Physiological Mechanisms
3.2.1 Hypocretin Peptide (orexin) produced by neurons located in hypothalamus Orexin = motivation to stay awake Destruction = narcolepsy
3.2.2 VLPA Group of GABA neurons in preoptic area, activity suppresses alertness & behavioral arousal, promotes sleep Destruction = total insomnia, coma, death in rats
4 Endogenous Cycles
4.1 Endogenous: generated by body
4.1.1 Circadian Rhythm wakefulness & sleep hormones secretion
4.1.2 Circannual Rhythm mostly in animals
4.1.3 Allows conservation of energy for future possible events
5 Sleep Abnormalities
5.1 Insomnia
5.1.1 Onset, Maintenance, Termination
5.2 Sleep Apnea
5.2.1 Inability to breathe while asleep Narrow Airway (obese) Brain mechanisms for respiration fail (elderly)
5.3 Narcolepsy
5.3.1 Sudden attacks of sleepiness Hypnagogic hallucinations ACh, Orexin deficiency Pemoline (Cylert)/Ritalin may relieve sleep but cause other problems
5.4 Periodic Limb Movement Disorder
5.4.1 Involuntary movement of limbs Middle age & elderly Tranquilizers sometimes
5.5 REM Behavior Disorder
5.5.1 Vigorous movement during REM
5.6 Night Terrors
5.7 Sleep Talking/Walking
6 SCN Damage
6.1 Suprachiasmatic Nucleus
6.1.1 Part of hypothalamus, bilateral Source of endogenous rhythm Damage = inconsistent rhythm, no light/dark synchrony
7 Chemical Control
7.1 Adenosine
7.1.1 Produces Sleepiness Caffeine inhibits
7.2 Prostoglandins
7.2.1 Promotes Sleep Inhibits Hypothalamus cells that + arousal
7.3 Basal Forebrain & Hypothalamus
7.3.1 Promotes sleep, release GABA Prolonged wakefulness if damaged Anesthesia increases GABA receptors
8 Function of Sleep
8.1 Repair & Restoration
8.1.1 Repair itself after exertions of the day
8.2 Evolutionary
8.2.1 Sleep conserves energy to search for food & keep safe from predators
9 Brain Structures of Wakefulness & Arousal
9.1 Reticular Formation
9.1.1 Medulla > Forebrain Lesions = v arousal NE
9.1.2 Pontomesencephalon Stimulation = + arousal
9.2 Locus Coeruleus
9.2.1 In pons Important for info storage (hippocampus) Mostly inactive during sleep (why we forget dreams)
9.3 Basal Forebrain & Axons
9.3.1 To thalamus & cerebral cortex + Arousal Damage = Alzheimers ACh
9.4 Hypothalamus
9.4.1 Stimulates arousal w histamine
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