Ch 4 Consciousness - Part 1 Flashcards
Describe consciousness?
Consciousness is awareness of everything around you and inside of your own head at any given moment. Used to organize your behavior, thoughts, sensations, and feelings. Generated from a set of action potentials. There is no single stream of consciousness, multiple channels each handling its own tasks —people must organize their conscious experience.
What are the two types of consciousness?
Waking consciousness are the thoughts, feelings, and sensations that are clear and organized.
Altered states of consciousness are the shifts in the quality or pattern of mental activity including; Daydreaming, Hypnotic state, Meditative state, Increased alertness, Divided attention, and Sleep.
What are the key factors involved in sleep and the circadian rhythm?
The key players in sleep and the circadian rhythm are suprachiasmatic nucleus (SCN) of the hypothalamus, pineal gland, and melatonin.
When it gets dark: the SCN triggers the secretion of melatonin from the pineal gland, making us feel sleepy.
When it gets light: the SCN stops the secretion of melatonin, allowing the body to waken
What are the other factors related to sleep?
Other Factors Related to Sleep are;
Serotonin aids in sleep regulation.
Body temperature- The higher the body temperature, the more alert we are; the lower the body temperature, the sleepier we are.
Adenosine - As adenosine builds up we become more sleepy.
Caffeine is an adenosine antagonist.
What happens if you don’t sleep?
Micro sleeps are brief periods of sleep that last only a few seconds. Missing a single night of sleep causes problems with concentration and simple task performance.
What are the sleep deprivation symptoms?
The sleep deprivation symptoms are trembling hands, inattention, staring off to space, droopy eye lids, general discomfort and psychological symptoms (i.e., irritability, depression, mania, hallucinations).
What happens in extended sleep deprivation?
Extended sleep deprivation is missing multiple days of sleep (no sleep or reduced levels of sleep). When this happens there is a significant impairment in functioning. Long term sleep deprivation can cause obesity, Impaired immune system functioning, and increased inflammatory response. Randy Garner (1965), Fatal familial insomnia.
Why do we sleep?
There are two theories on why we sleep, Adaptive Theory of Sleep and Restorative Theory of Sleep.
What is the Adaptive Theory of Sleep?
Adaptive Theory of Sleep says sleep is a product of evolution. We want to stay safe from predators! Explains why we sleep when we sleep. Evidences found in the relationship b/w amount of time particular animals sleep and status on the food chain.
What is the Restorative Theory of Sleep?
Restorative Theory of Sleep states sleep is necessary for physical health. Explains why we sleep in general. Evidence is found in the fact that most bodily growth and cellular repair occur at night in deepest stages of sleep.
What are the two kinds of sleep?
The 2 kinds of sleep are REM (Rapid Eye Movement) sleep, which is active sleep, you dream during this stage, and voluntary muscles are paralyzed.
Non‐REM sleep is restful sleep and voluntary muscles are not paralyzed.
What is an EEG?
EEG are used to record brain wave activity and determine what stage of sleep people are in. When people are awake and alert: beta waves (very small and fast). When people are relaxed and drowsy: alpha waves (slightly larger and slower).
Describe Non-Rem Stage 1 (N1)?
Non‐REM Stage 1 sleep (N1), are when theta waves replace alpha waves (even slower). This is light sleep – people will deny they were sleeping. Hypnic jerk is common in this stage. Some people hallucinate falling into this stage, called hypnogogic images or hallucinations
What is Non-Rem Stage 2 (N2)?
Non‐REM Stage 2 sleep (N2): Body temperature drops, heart rate slows, and breathing becomes more shallow. Characterized by sleep spindles Theta waves continue during the N2 stage. If awakened, people are aware that they were asleep.
What is Non‐REM Stages 3 and 4 (N3)?
Non‐REM Stages 3 and 4 (N3); Stage 3: delta waves start (slowest and largest)
Stage 4: deepest sleep. Body growth occurs during N3. If you wake a person up during this stage, they will be disoriented.