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WorksheetsPSY100 Module 2
Total questions: 118
Worksheet time: 30hrs 30mins
Breland and Breland's work with "miserly raccoons" demonstrated
how principles of reinforcement (derived from studies of rats and pigeons) easily generalize to raccoons
differences in appropriate rewards for different species
that there are biologically imposed limits to the generality of conditioning principles
that raccoons are less conditionable, and therefore less intelligent, than rats and pigeons
Victor Vasarely pioneered an approach called
pointillism
kinetic art
cubism
proximal-closure
A dog is first conditioned to salivate to a tone. Then, a light is paired with the tone for a number of trials; finally, the light is presented alone, and the dog responds. This procedure is known as
chaining
higher-order conditioning
compound conditioning
sensory preconditioning
The theorist who advanced the wish-fulfillment idea about dreaming was
Cartwright
Hobson
McCarley
Freud
Sleep spindles, which appear against a background of mixed, mostly lower frequency EEG activity, are characteristic of
stage 1 sleep
stage 2 sleep
stage 4 sleep
REM sleep
There is strong evidence that marijuana causes __________ in humans
permanent brain damage
male sterility
birth defects
none of these effects
Shelby created an animated scene using her computer. She drew a frog as he started to jump, and then drew the frog landing. The computer created 24 pictures between these two points, which adjusted the frog's position very slightly. When the entire sequence of 26 pictures is displayed in rapid succession, the frog appears to hop smoothly. This perception of smooth action is one example of
preattentive processing
the phi phenomenon
bottom-up processing
feature detection
Carson used to really enjoy lime sherbet and when he was in Mexico he tried frozen lime margaritas. After his fourth margarita Carson became extremely ill. Now he finds that even the sight of lime sherbet in a bowl can make him feel queasy. In this example, the unconditioned stimulus is
the lime margaritas that Carson consumed
the illness that followed the fourth margarita
the sight of lime sherbet
the queasiness that Carson feels when he sees lime sherbet
Our sense of smell shows evidence of sensory adaptation. The perceived strength of an odor usually
fades to less than half its original strength within about four minutes
increases to more than twice its original strength within about four minutes
fades to less than half its original strength within a few seconds
slowly increases over time, reaching a maximum in about 15 minutes
When Celeste was playing her stereo at 40 decibels and she turned it up to 44 decibels, she could notice that it was louder. Based on this information you could predict that if Celeste has her stereo playing at 80 decibels, her just noticeable difference for loudness would be
4 decibels, the same as it was at 40 decibels
2 decibels , half as much as it was at 40 decibels
impossible to determine without more information
8 decibels, twice as much as it was at 40 decibels
A system for administering symbolic reinforcers that can later be exchanged for "genuine" reinforcers is referred to as
vicarious conditioning
token economy
a behavioral contract
antecedent control
Imagine that biologists have discovered an animal that has eyes very similar to human eyes, but that the only receptor cells in the retina are cones; there are no rods. Based on what is known about human vision you might expect that this animal would have
poor visual acuity
poor peripheral vision
poor vision in bright illumination
no color vision
According to Freud, the manifest content of a dream is the
hidden meaning of the dream
sexual content of the dream
content of the dream indicative of the person's hostility
actual content of the dream at the surface level
The idea of multifactorial causation in drug effects suggests
that taking several different drugs at the same time reduces their effects
that taking several different drugs at once increases their effectiveness
that the effect of a drug depends on dosage, user's age, mood, motivation, experience, and personal makeup
none of these things
Meditation has its roots in
early Christianity
Eastern religions
transcendental psychology
the scientific study of the relaxation response
Overall, it appears that we perceive
changing stimuli better than constant ones
constant stimuli better than changing ones
long-acting better than short-acting stimuli
stimuli that are steady in the environment
Which of the following most clearly shows that an animal's biological makeup greatly affects ease of learning an association?
Pavlov's dogs, bells, and salivation
Thorndike's cats in a puzzle box
Skinner's rats in an operant chamber
Seligman's sauce béarnaise phenomenon
Katrina is trying to put a dollar bill into a vending machine in her office. Sometimes the machine will take a dollar bill on the first try, other times it can take up to five or six tries before the dollar bill is finally accepted. In this example, inserting a dollar bill into the vending machine is reinforced on
a continuous reinforcement schedule
a noncontingent reinforcement schedule
an intermittent reinforcement schedule
a short-delay reinforcement schedule
Dan was able to tell that the voice he heard calling his name was coming from the building on his left because of
auditory localization
depth perception
perceptual constancy
perceptual set
Mateen has been selectively deprived of slow-wave sleep for five nights. You would expect that on the sixth, undisturbed night, he will
show increased stage 4 sleep
show increased REM sleep
show decreased stage 4 sleep
show decreased REM sleep
David is asleep and his eyelids are evidencing little ripples back and forth. We can conclude that David is
in alpha state
having a seizure
dreaming
doing none of these
Tessa really likes to mow the lawn during the summer months, but her parents will only let her mow the lawn if all the dishes are washed. Consequently, every Saturday Tessa has the table cleared and all the dishes washed as soon as everyone has finished breakfast. In this case
mowing the lawn is a negative reinforcer for doing the dishes
doing the dishes is a positive reinforcer for mowing the lawn
mowing the lawn is a positive reinforcer for doing the dishes
doing the dishes is a negative reinforcer for mowing the lawn
The process of selectively reinforcing responses that are closer and closer approximations of some desired response is called
stimulus discrimination
selection
shaping
step-wise conditioning
Mariah developed a fear of the water when she fell off a river raft last summer. This year she took swimming lessons and thought she had finally overcome her fear of water. She was eagerly looking forward to an upcoming rafting trip, however, as soon as she stepped onto the raft she was instantly terrified again. This illustrates the classical conditioning process known as
extinction
second-order conditioning
stimulus generalization
spontaneous recovery
A police officer asked Stanley to close his eyes and touch the tip of his nose using first his right index finger and then his left index finger. To complete this test of coordination Stanley would need to rely on
his vestibular sense
his reticular sense
sensory accommodation
his kinesthetic sense
At the musical he attended over the weekend, Andrew noticed that whenever the red and green spotlights overlapped, they seemed to change to a yellow spotlight. This can be explained using the principles of
additive color mixing
subtractive color mixing
hypercomplex feature detection
opponent-processing of colors
Joshua experiences reflexive gasping for air during sleep several times a night and frequently wakes up because of it. Joshua most likely has
night terrors
narcolepsy
sleep apnea
lack of NREM rebound
Gabriella was looking for shelter from the sudden cloud burst, and at first she had difficulty judging whether the old barn or the farmhouse was closer. However, when she noticed that the barn partially obscured the corner of the house she headed for the barn. She was able to judge which building was closer based on
texture gradient
interposition
relative size
linear perspective
Which of the following sleep disorders is most life threatening?
nightmares
narcolepsy
sleep apnea
somnambulism
The EEG pattern associated with normal, waking, alert states is
gamma
beta
alpha
delta
Alexander is hooked up to an electroencephalograph (EEG) in a sleep lab. As the researcher watches the printout from the EEG, theta waves appear. Based on this information, the researcher can conclude that Alexander
has just entered Stage 3 sleep
is still awake, but is relaxed and drowsy
has just entered Stage 1 sleep
is currently in REM sleep
Imagine that biologists have discovered an animal that has eyes very similar to human eyes, but that the only receptor cells in the retina are rods; there are no cones. Based on what is known about human vision you might expect that this animal would
have poor vision in low illumination
have no color vision
have poor peripheral vision
be able to detect extremely fine details
If you mix red, green, and blue paint, you will get
purple
white
orange
black
The major difference between a CS and a UCS is
the order in which they are presented
that one reliably elicits the response of interest prior to conditioning while the other does not
that during conditioning the response to one increases while the response to the other decreases
the strength of the response that each stimulus elicits
In setting up reinforcement contingencies in a self-modification program, you should
choose a reinforcer that is readily available and relatively potent
use delayed reinforcement
arrange to reinforce yourself only after there has been a drastic change in the frequency of the target response
use continuous rather than intermittent reinforcement
Positive reinforcement involves
the presentation of a pleasant stimulus
the presentation of an unpleasant stimulus
the removal of a pleasant stimulus
the removal of an unpleasant stimulus
Ron is making potato soup. His roommate tastes it and tells Ron it is great, but Ron thinks it needs more salt. He adds just a little salt, and thinks the soup now tastes perfect. However, his roommate tastes it again and tells Ron that the soup is ruined because it is too salty. Apparently, for the taste of salt
Ron can detect a smaller just noticeable difference than his roommate
Ron's roommate can detect a smaller just noticeable difference than Ron can
Ron has a higher absolute threshold than his roommate does
Ron has a lower absolute threshold than his roommate does
Receptors for the kinesthetic sense are found in the
cochlea
semicircular canals
basilar membrane
joints and muscles
__________ means treating two stimuli alike; __________ means treating two stimuli differently.
Acquisition; extinction
Generalization; discrimination
Extinction; acquisition
Discrimination; generalization
Sensory adaptation can explain all of the following except
getting used to the smell of the perfume you are wearing
hearing your name spoken in a noisy room
feeling comfortable in a cold swimming pool after being in for a few minutes
getting used to the touch of your clothes on your skin
There is the greatest amount of debate on the risks associated with which of the following drugs?
marijuana
alcohol
cocaine
heroin
Sleep apnea is characterized by
a sudden, irresistible urge to sleep during normal waking hours
a reflexive gasping for air during sleep
an extremely low rate of REM
"night terrors"
The lights around the movie marquee flashed on-and-off in succession. However, Jerome did not perceive them as separate lights flashing, but instead saw a continuous band of light moving around the edge of the marquee. Jerome's perception illustrates
the phi phenomenon
bottom-up processing
feature detection
preattentive processing
The sensory receptors for smell are referred to as
smell buds
gustatory bulbs
olfactory cilia
psiatic receptors
Which of the following can cause disruption of your vestibular system?
riding on an amusement park thrill ride that spins you around
having an upset stomach
having a cold that temporarily robs you of your sense of taste
temporarily losing sensation in your arm because you slept on it
A conscious attempt to focus one's attention in a nonanalytical manner is called
meditation
dissociation
Zen Buddhism
hypnosis
The use of dreams to satisfy ungratified needs is referred to as
id idealization
self-centeredness
wish fulfillment
sublimation
Which of the following statements regarding dreams is not accurate?
Dream recall is best when people are awakened during or very soon after a dream
Dreams flash through consciousness instantaneously
We dream whether we remember our dreams or not.
Trying to remember dreams can aid dream recall
Assuming the reinforcer is the sound of the rattle, a baby's response of shaking a rattle is reinforced according to which type of schedule?
continuous reinforcement
fixed-interval
variable-interval
variable-ratio
Timothy was painting a picture of a jet on a runway; however in his painting the sides of the runway are parallel to each other. Timothy's picture will seem to lack depth because he has failed to make use of the monocular depth cue of
convergence
motion parallax
linear perspective
height in plane
Breland's trained raccoons would deposit single tokens into a slot but would not deposit two tokens, which they rubbed together. This is due to
instinctive drift to food-washing behavior
poor conditioning of token placing
insufficient reinforcement of token placing
lack of interest in the single tokens
Juan and Karletta were walking one night when they heard a car backfire. Juan was convinced the sound came from directly in front of them, and Karletta was convinced the sound came from directly behind them. One reason they might have difficulty localizing the sound is
the sound waves would have arrived at both ears at the same instant
we are able to judge distance better than direction for sounds
sound localization is more difficult in the dark
only speech sounds can be accurately localized
Severing the ascending reticular activating system in cats caused them to
become very aggressive
become very fearful
remain in continuous wakefulness
remain in continuous sleep
You are watching a cumulative recorder that is connected to a small disk in a chamber. The pigeon has been trained to peck the disk when a red light is turned on, and not to peck the disk when a green light is turned on. Based on this information you should observe that when the green light is turned on,
the slope of the line on the cumulative recorder will be steeper than when the red light is turned on
the pen on the cumulative recorder will start to move downward
the slope of the line on the cumulative recorder will be shallower than when the red light is turned on
the roll of paper in the cumulative recorder will stop moving
Among the physiological changes that occur when you are dreaming is (are)
transition to alpha waves
rapid eye movements
increased voluntary muscle activity
all of these
The reappearance of a conditioned response after extinction and a period of rest is called
disinhibition
reconditioning
stimulus generalization
spontaneous recovery
A woman reported feeling "weak in the knees" whenever she smelled cigarette smoke and Beemans gum, because of the association of these smells with her first love. In this example, her "weak knees" would be
an unconditioned response
a conditioned stimulus
an unconditioned stimulus
a conditioned response
The overall effect of a drug on an individual is influenced by which of the following?
the individual's motivation and expectations
the personality of the individual taking the drug
the dose and potency of the drug
all of these factors
Kara has just fallen asleep and immediately slips into REM. Kara has probably experienced or undergone
sleep deprivation
alcohol overdose
NREM rebound
biofeedback training
An EEG would indicate primarily __________ activity in a person who is meditating with eyes closed.
alpha
beta
delta
theta
If a 100-Hz tone had to be increased to 110 Hz for a subject to just notice the difference, you would predict that a 1000-Hz tone would have to be increased to
1010 to be noticed
1050 to be noticed
1100 to be noticed
1200 to be noticed
What appears to be responsible for regulating the circadian rhythm?
amount of time spent sleeping
amount of time spent awake
cultural practices
exposure to light
Which of the following drugs is least likely to result in a fatal overdose
LSD
heroin
cocaine
barbiturates
Images that occupy more space on your retina are seen as nearer relative to images that occupy less space. This is a cue to depth perception known as
accommodation
foveal disparity
phrenetic search
relative size
The matching law states that under concurrent schedules of reinforcement, organisms' relative rate of responding to each alternative
tends to increase steadily over time
tends to decrease steadily over time
tends to match each alternative's relative rate of reinforcement
tends to fluctuate randomly across the alternatives
The electroencephalograph is used in sleep research to measure brain-wave activity in the
corpus callosum
cerebral cortex
hypothalamus
medulla
An antecedent in a behavior modification program is
a source of a reinforcement
an event that precedes a behavior
a consequent of performing a behavior
an emotional component associated with the receipt of reinforcement or punishment
Which of the following is not good advice for combating insomnia?
Develop a bedtime sleep ritual
Read a dull textbook before going to bed
Avoid taking naps during the day
Have a cup of warm coffee just before going to bed.
12) Which of the following describes how we hear according to place theory?
Different sound frequencies vibrate different portions of the basilar membrane, producing different pitches.
Our perception of pitch corresponds to the rate or frequency at which the entire basilar membrane vibrates.
We perceive differences in pitch according to the number of hair cells that vibrate at any one time.
Different sound frequencies affect the intensity with which the membrane separating the middle ear from the inner ear vibrates, producing different pitches.
Frederick cringes every time he hears a dentist's drill, even when he is sitting in the waiting room of his dentist's office. In this example, the pain of dental drilling is
a conditioned response
an unconditioned stimulus
an unconditioned response
a conditioned stimulus
When an animal's innate response tendencies interfere with the conditioning process, it is referred to as
learned helplessness
instinctive drift
counterconditioning
misbehavior
In classical conditioning, the stimulus that is originally neutral in regard to the response to be learned is the
unconditioned stimulus
unconditioned response
conditioned stimulus
conditioned response
Mixing many, varied paints together would tend to produce a __________, while projecting many varied colored spots on the same area of a screen would tend to produce a
bright, light color; dark, dull color
dull, dark color; light, whitish color
reddish color; bluish color
dull, dark color; dull, dark color
In order to maximize visual acuity at night, you should
look directly at the object you wish to see
turn your head at a slight angle to the object
close one eye
blink your eyes several times to hasten dark adaptation
The brain receives information about the positions of the various parts of the body through the
vestibular sense
kinesthetic sense
kinetic sense
homeostatic sense
Pitch perception can best be explained by __________ for very low-pitched sounds, __________ for very high-pitched sounds, and __________ for pitches in the middle range
place theory; frequency theory; place theory
frequency theory; both theories; place theory
place theory; both theories; frequency theory
frequency theory; place theory; both theories
Carly used to be afraid of visits to her family doctor because she associated the sight of his waiting room with the pain of having a blood sample drawn. However, Carly's new doctor's lab worker is "painless" and the sight of the waiting room is no longer associated with pain. Consequently, Carly finds her fear of visits to her family doctor has disappeared. This illustrates the classical conditioning process known as
spontaneous recovery
extinction
second-order conditioning
avoidance
You are watching a pigeon pecking a disk in a small chamber. There is a cumulative recorder connected to the disk. While you are watching, the pigeon is pecking at a slow, steady rate. Based on this information, you can predict that the line on the cumulative recorder will
have a steep, upward slope
have a shallow, upward slope
have a shallow, downward slope
have a steep, downward slope
Voluntary muscle activity
is at its lowest during REM sleep
is at its highest during REM sleep
does not occur in NREM sleep
does not occur during either REM or NREM sleep
Studies indicate that partial sleep deprivation can impair which of the following?
attention
reaction time
decision making
attention, reaction time, or decision making
Primary reinforcers __________, while secondary reinforcers __________.
depend on learning; satisfy biological needs
satisfy biological needs; depend on learning
are associated with classical conditioning; are associated with operant conditioning
are associated with operant conditioning; are associated with classical conditioning
In the __________ culture, dreams are viewed as the focal point of existence that determines an individual's way of life.
Marakesh of Morocco
aborigines of Australia
Arapesh of New Guinea
Parintinin of Brazil
Dissociation refers to
a loss of inhibition by hypnotized subjects
a hypnotized subject's willingness to act out the hypnotist's suggestions
a splitting of mental processes into two separate, simultaneous streams of awareness
role playing by hypnotized subjects in response to situational cues
Jacob has been working at his computer for the past 2 hours, and the hum that he found so annoying when he started no longer bothers him. The change in Jacob's sensitivity to the noise from the computer illustrates the process known as
perceptual invariance
perceptual assimilation
adjusting just noticeable differences
sensory adaptation
Rather than provide details about the party she just attended, Patty tried to give her overall impression, operating on the assumption of __________, that the whole may be greater than the mere sum of its parts
psychophysics
holistic psychology
Gestalt psychology
psychodynamics
Which of the following has been used with modest success in the treatment of narcolepsy?
group therapy
cognitive-behavioral therapy
sedative drugs
stimulant drugs
The most widely used recreational drug in the United States is
cocaine
alcohol
marijuana
the barbiturates
When Lindsay was nine years old the neighbor's chihuahua bit her on the ankle. Today Lindsay is still terrified of chihuahuas, but she likes almost all other types of dogs. Lindsay's fear illustrates the classical conditioning process of:
instinctive drift
stimulus discrimination
stimulus generalization
stimulus generalization
The sense associated with the perception of smell is
gustation
olfaction
kinesthesis
audition
Stage 1 sleep is represented by EEG brain-wave patterns referred to as
alpha waves
REM waves
synchronisitic waves
theta waves
Slow-wave sleep refers to stages __________ and an EEG rhythm of __________
1 and 2; theta
2 and 3; alpha
1 and 4; theta
3 and 4; delta
A conditioned stimulus is
a stimulus that elicits an unconditioned response without previous conditioning
an unlearned reaction that occurs without previous conditioning
a previously neutral stimulus that has, through conditioning, acquired the capacity to elicit a conditioned response
a learned reaction that occurs because of previous conditioning
Sonja put on a new watch this morning and found it uncomfortable because it was so much heavier than her old watch. However, at noon, when a friend asks her if she knows what time it is, Sonja finds she has forgotten she is even wearing the watch. The change in Sonja's sensitivity to the pressure of the watch illustrates the process known as
sensory adaptation
perceptual invariance
perceptual assimilation
adjusting just noticeable differences
Harold begins to chew his fingernails every time his teacher enters the classroom. In this case the antecedent is
the teacher entering the classroom
the fear associated with the teacher
anticipated punishment
chewing the fingernails
In Western cultures, dreams are largely written off as insignificantThe idea that hypnosis is associated with divided consciousness and is an altered state is most consistent with which of the following theories of hypnosis
Barber's role theory
Schachter's cognitive theory
Freud's psychoanalytic theory
Hilgard's dissociation theory
Which of the following statements about culture and dreams is not accurate?
Some basic dream themes appear to be nearly universal across cultures
People in Western societies tend to recall their dreams vividly
In many cultures, dreams are seen as a window into the spiritual world
In Western cultures, dreams are largely written off as insignificant
If you project a red, a green, and a blue light into space, the point at which the three lights cross will lead to the perception of
black light
ultraviolet light
white light
infrared light
The kinesthetic system relates to
maintaining the relative position of body parts
the location of the body in space
the sense of forward acceleration
sensing body movement, as in a car
Evelyn turned the thermostat up from 68 degrees to 70 degrees; however, she doesn't think it feels any warmer and she wants to turn it up even higher. Her roommate thinks that it is now too hot, and she wants to turn the thermostat back down. Apparently Evelyn has
a smaller just noticeable difference for temperature than her roommate does
a lower absolute threshold for temperature than her roommate does
a larger just noticeable difference for temperature than her roommate does
a higher absolute threshold for temperature, compared to her roommate
"Manny got out of bed and began doing calisthenics during REM sleep, probably because he was dreaming about boot camp." What is wrong with this statement?
Sleep is a relaxed condition of the body and, as such, precludes physical activity
Research shows that no dreaming takes place in REM sleep.
Research shows that we are virtually paralyzed in REM sleep
Manny was never in boot camp so he is not likely to be dreaming about it
Alcohol appears to contribute to about __________ percent of student rapes on college campuses.
25
50
75
90
Clifford was in an accident and he has lost all the hearing in his right ear. The deafness in this ear will mostly affect Clifford's ability to
localize sounds accurately
separate speech sounds from background noise
detect high frequency sounds
detect high amplitude sounds
Which of the following is not one of the four basic tastes?
salty
citrus
sweet
bitter
One hypothesis regarding the cause of crib death in babies is that they stop breathing during sleep, a sleep disorder known as
narcolepsy
sleep apnea
night terror
hypersomnia
If selectively deprived of REM sleep, a person will experience __________ later
hypochondriasis
emotionality
NREM
REM rebound
Of the following, the only sensory system that does not project upward to the cerebral cortex through the thalamus, is
vision
hearing
gustation
olfaction
____ 2) Simon cringes every time he hears a dentist's drill, even when he is sitting in the waiting room of his dentist's office. In this example, cringing in the waiting room is
an unconditioned response
a conditioned stimulus
a conditioned response
an unconditioned stimulus
Which of the following drugs has the greatest number (and most diverse) negative effects on physical health?
LSD
heroin
alcohol
cocaine
When Antonio was sick as a child his mother would always make him vanilla pudding; to Antonio it seemed like the vanilla pudding made him feel better. Even now, he still gets a good feeling when he starts to prepare some vanilla pudding, but not when he starts to make any other type of pudding. This example illustrates the classical conditioning process of
stimulus generalization
instinctive drift
negative avoidance
stimulus discrimination
most vivid dreams generally occur
during REM sleep
during NREM sleep
during the early hours of sleep
when alpha brain waves are present
Continuous reinforcement occurs when
reinforcement is delivered continually, regardless of whether or not a response is made
it is not known in advance what responses will be reinforced
every behavior engaged in by the subject is reinforced
every occurrence of the designated response is reinforced
The successive blinking on and off of the lights on the neon sign gave the impression of beer filling a glass. This illusion of motion is the
phi phenomenon
constancy principle
common-fate principle
motion parallax effect
Petra looked directly into a very bright light and damaged her retina. The opthamologist has told her that she has sustained massive damage to her cones, but for the most part her rods have not been affected. One change that you could predict for Petra's vision is that she will now have
poor vision in low illumination
poor peripheral vision
no color vision
more accurate depth perception
An electroencephalograph is a device that measures
glucose metabolism in the brain
muscle tension in the body
respiration rates as an index of arousal
electrical activity of the brain
Ken used to drool at the smell of peanut butter cookies as they baked, and he couldn't wait to sink his teeth into that first cookie. However, Ken's new roommate makes terrible peanut butter cookies and the smell of them baking is no longer associated with a wonderful taste experience. Consequently, Ken finds that the smell of the cookies no longer makes him drool in anticipation. This illustrates the classical conditioning process known as
spontaneous recovery
second-order conditioning
extinction
avoidance
According to optimal foraging theory, predatory animals will usually
pursue small prey that requires little effort to catch
pursue large prey that requires greater effort to catch
pursue small prey only if foraging in large groups
maximize nutritional value relative to the energy they expend in hunting
Nathan is watching the cumulative recorder that is connected to a box where a rat is pressing a lever to receive food reinforcement. The slope of the line is becoming flatter and flatter over time. Based on this output, Nathan can conclude that the rat's response rate
is increasing over p
will soon show spontaneous recovery
is decreasing over time
is caused by inadequate stimulus generalization
Which of the following statements about dreams is most accurate?
Only about 75 percent of all people dream
The reason we do not remember our dreams is that the content of the dream is repressed
People cannot remember their dreams because of too much time passing between when they dreamed and when they try to recall the dream.
Most dreams people can remember deal with sexually oriented topics
