– Refers to an organism’s awareness
of itself and its surroundings.
• Levels of awareness:
– TOP: Controlled processes
• Require full attention
– Interfere with other functions
• Someone calling your name when your watching the game.
– MIDDLE: Automatic processes
• Require minimal attention
– Such as riding your bike
– LOWEST: Minimal or no awareness of the
• Many of our behaviors display rhythmic
– Circadian rhythms
• One cycle lasts about 24 hours (e.g. sleep-waking
• Light is an external cue that can set the circadian
• Some circadian rhythms are endogenous suggesting
the existence of an internal (biological) clock.
• Sleep is a behavior AND an altered state of
• We spend about a third of our lives in sleep.
– A basic issue is to understand the function of sleep.
Myths of Sleep
• Everyone needs 8 hrs of sleep per night to
maintain good health.
• No longer a myth
• In order to perform at optimal level
• Learning of complicated subjects such as calculus
can be done during sleep.
• Some people never dream.
• Dreams last only a few seconds.
• Genital arousal during sleep reflects dream
• May be a useful index of physical versus psychological
causes of impotence in males
EEG Changes During Sleep
• Electrophysiological instruments
can be used in the sleep
laboratory to assess the
physiological changes that occur
during an episode of sleep.
Stages of Sleep
• Hypnagogic state: “pre-sleep” stage marked by
visual, auditory and kinesthetic sensations.
• REM: rapid eyes movements, high frequency brain
waves, paralysis of large muscles and dreaming
Functions of Sleep
• REM Sleep:
– Consolidation of new memories
– Role in learning
– Absent in lower mammals
• Non-REM sleep
– People deprived of all sleep show greater time
spent in non-REM sleep the next night.
Functions of Sleep
• New research shows that sleep helps
implant emotional memories and delete
Effects of Sleep Deprivation
Reduced concentration and motivation
Lapses in attention
Reduced motor skills
Theories of Sleep
– Sleep allows for recuperation from physical,
emotional, and intellectual fatigue.
– Sleep evolved to conserve energy and protect
our ancestors from predators.
Theories of Dreaming
• Psychoanalytic: Dreams represent
disguised symbols of repressed desires and
– Manifest versus latent content
• Biological: Dreams represent random
activation of brain cells during sleep.
• Cognitive: Dreams help to sift and sort the
events of the day.
– Difficulty in getting to sleep or remaining asleep and has
– Situational: related to anxiety
– Drug-induced: Use of sleeping pills or other drugs can result
Person stops breathing and is awakened when blood levels of
carbon dioxide stimulate breathing.
– Sleep appears at odd times.
– Sleep attack: urge to sleep during the day
– Anxiety-arousing dreams
– Generally occurring during REM sleep.
• Night Terrors:
– Usually boys 4-12.
– Abrupt awakenings from NREM sleep
– Feelings of panic
– Chemicals that have biological effects within the
• Psychoactive drugs
– Chemicals that change conscious awareness or
– Depressants slow down the nervous system.
– Stimulants speed up the nervous system.
– Opiates relieve pain.
– Hallucinogens alter sensory perception .
Drug Use and Abuse
• Drug abuse:
– Drug use that causes emotional or physical harm to the
– Results from repeated drug use.
– More drug is required.
– Drug abstinence leads to withdrawal symptoms.
Drug Use and Abuse
• Drug dependence can be:
• Withdrawal reactions are noted when drug use is
• Associated with a craving for the drug
• Alcohol is particularly dangerous when combined
– Abuse can lead to serious losses in cognitive
– In US involved in nearly ½ of all:
Accidental deaths in the
– 3rd leading cause of birth defects
– Considered single most preventable cause of
death & disease in US.
Causes physical damage
Can interfere with electrical activity of the heart
– Such as morphine & heroin, produce their
effects by mimicking endorphins.
• LSD- associated with “bad trips”
• Marijuana has some properties of
depressants, narcotics and hallucinogens at
• MDMA (Ecstasy)
– High doses can cause
• Dangerous increases in body temperature
• Dangerous increases in blood pressure
• Can produces long lasting damage to the brain.
Factors that Lead to Drug Abuse
• Positive associations: the drug is portrayed in a
positive fashion in the media.
• Biological factors: the drug induces a pleasurable
state (usually related to dopamine activity in the
• Prevention of withdrawal: person continues to
take the drug to avoid withdrawal effects.
• Conditioning of drug craving: cues associated
with drug use can elicit craving for the drug.
• Hypnosis is an altered state of heightened
• The hypnotic state is characterized by:
Narrow and focused attention
Passive receptive attitude
Reduced reaction to pain
Myths of Hypnosis
• People can be hypnotized against their will.
• People will do immoral things while
• Hypnosis improves memory recall.
• Hypnotized persons have special strength.
• Hypnosis is fake.
• refers to a set of techniques that promote a
heightened sense of awareness.
– can involve body movements and posture,
focusing of attention on a focal point, or control
– can induce relaxation, lower blood pressure,
and can be associated with a sense of euphoria
Why do people alter
• Sacred rituals
• Social interactions
• Individual rewards