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Sensation and Perception
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Module 12
Objectives
– Contrast sensation and perception, and explain
the difference between bottom-up processing
and top down processing.
– Distinguish between absolute and difference
threshold.
– To discuss perceptional differences using
theories such as Weber’s Law, JND, signal
detection, etc
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How would you define
sensation?
formal definition - immediate
response in the brain caused by
excitation of a sensory organ
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What are the sense organs?
Eyes, ears, tongue, skin, and
nose
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Based on what we know about
the brain, do all the sense organs
relay information to the same
place?
NO!
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How would you define
perception?
formal definition – process by which
we select, organize and interpret
sensations
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Read the following passage
• Aoccdrning to rscheearch at Cmabrigde
uinervtisy, it desn’t maettr in what oredr the
ltteers in a word are, the olny iprmoetnt
tihng is that the frist and lsat ltteer be at the
rgiht plcae. The rset can be a toatl mses and
you can still raed it wouthit a porbelm. This
is bcuseae the hmuan mnid deos not raed
ervey lteter by islef, but the word as a
wlohe.
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Bottom-up Processing Analysis of the stimulus begins with the sense
receptors and works up to the level of the brain and mind.
Letter “A” is sensed as a black blotch decomposed into features by the brain and perceived as an “A” by our
mind .
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Top-Down Processing Information processing guided by higher-level mental processes as we construct perceptions drawing on our experience and expectations.
THE CHT
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Subliminal Persuasion
• What is it?
• Why do we believe this exists?
• Popular Movies
– Post Korean War = Manchurian Candidate
– Modern = Long Kiss Goodnight, Bourne Series
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Localization of function
The principal that the type of
sensation experienced is related to
the area of the brain activated.
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How do data reduction systems
work?
One: Our sensory receptors are all biological
transducers…
…meaning they naturally convert energy from
one system into another.
Two: Each sense organ is most sensitive to a
select type and range of energy.
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As your sensory receptors transduce
information, they also analyze the
environment before they send the message to
the brain.
This separation of sensory
information into important features
is called sensory analysis.
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• Our sensory receptors are pre-tuned to
specific stimulus patterns, called feature
detectors.
• The basic elements of a stimulus, such as
lines, shapes, edges, colors, are called
perceptual features.
• Example: In a series of straight lines, a
diagonal line would stand out to the eye.
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Studies have shown that faces
that are more symmetrical are
found to be more attractive.
Based on what we’ve just
discussed, why would that be
true?
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Back to the data reduction system…
• Once our sensory receptors have selected
and analyzed information, they must code
it.
• This is when they convert important
features of the world into neural messages
that can be understood by the brain.
• This is called sensory coding.
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• These messages are then sent to certain areas of the
brain, which respond according to their function.
• So if someone punches you in the eye, your sensory
receptors in the eye will respond somewhat to
pressure, but they code the information visually, so
you see bright spots and/or flashes of color.
Remember!!
• All of your sensory experiences actually take
place in the brain.
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Psychophysics
• The study of the relationship between physical stimuli and the sensations they evoke in a human observer.
• One of the basic questions psychophysics asks is…
• “What is the absolute minimum amount of energy necessary for a sensation to occur?”
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Psychophysics
A study of the relationship between physical characteristics of stimuli and our psychological
experience of them.
Physical World
Psychological World
Light Brightness
Sound Volume
Pressure Weight
Sugar Sweet
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Absolute threshold
• The minimum amount of of physical energy needed to produce a sensation.
• Vision – 3 photons of light
• Equivalent to seeing a candle flame 30 miles away on a clear, dark night (remember this??)
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No
Detection
Intensity
Absolute Threshold
Detected
Yes Yes No No
Observer’s Response
Tell when you (observer) detect the light.
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Difference threshold
• A change in stimulus intensity that is
detectable to an observer.
Just noticeable difference
(JND)
• Any noticeable difference in a stimulus.
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Difference Threshold Difference Threshold: Minimum difference
between two stimuli required for detection 50% of the time, also called just noticeable difference
(JND). Difference Threshold
Tell when you (observer) detect a difference in the light.
No Observer’s Response
No Yes
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Weber’s Law
Two stimuli must differ by a constant minimum percentage (rather than a constant amount), to be
perceived as different. Weber fraction: k = I/I.
Stimulus Constant (k)
Light 8%
Weight 2%
Tone 3%
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Weber’s Law
• The JND is a constant proportion of the
original stimulus intensity.
• Time for a demonstration!
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Do absolute thresholds differ for
different people?
Of course!
Type of stimulus, state of a person’s nervous
system,costs of false “detections” and
emotional states all effect the absolute
threshold, even within the same individual
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• Unpleasant stimuli may raise the threshold
for recognition.
• Resistance to perceiving threatening or
disturbing stimuli is called perceptual
defense.
• We process stimuli on more than one level.
• Subliminal perception – perception of a
stimulus below the threshold for conscious
recognition
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What do you see at first an old lady or a
young woman?
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Optical Illustions
Here is an example
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Inattentional Blindness Inattentional blindness refers to inability to see a an object or a person amidst an engrossing scene.
Here is an example.
Dan
iel
Sim
ons,
Univ
ersi
ty o
f Il
linois
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Change Blindness
• Definition: phenomenon that occurs when a
person viewing a visual scene apparently
fails to detect large changes in the scene
Here is an example
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Signal Detection Theory (SDT) Predicts how and when we detect the presence of a faint stimulus (signal) amid background
noise (other stimulation). Assumes that there is no single absolute threshold and detection
depends on:
Person’s experience Expectations Motivation Level of fatigue
Caro
l Lee/ T
ony S
tone Im
ages
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Signal Detection Theory (SDT)
• Examples:
– Is my phone ringing or is it the phone on the
TV?
– Is this crazy story true?
– (In the car) Is someone squealing tires or is it
the ad on the radio?
– Let’s try an experiment.
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SDT Matrix
Decision
Yes No
Signal
Present Hit Miss
Absent False
Alarm Correct
Rejection
The observer decides, whether she hears the tone or not, based on the signal being present or not.
This translates into four outcomes.
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Shape Detection Is
hai
, U
nger
leid
er,
Mar
tin a
nd
Hax
by/
NIM
H
Review of Sensation
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Racial and ethnic stereotypes can
sometimes bias our perceptions of others'
behaviors. This best illustrates the impact
of:
A. retinal disparity.
B. interposition.
C. top-down processing.
D. perceptual adaptation.
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The fact that perceptions involve
more than the sum of our sensations
best illustrates the importance of:
A. top-down processing.
B. interposition.
C. retinal disparity.
D. visual capture.
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Which of the following is TRUE?
A. Humans cannot sense stimuli below the absolute threshold.
B. Humans cannot be affected by stimuli below the absolute threshold at all.
C. Stimuli presented below the absolute threshold can have a subtle, brief effect on behavior.
D. Stimuli presented below the absolute threshold exert a strong, powerful effect on behavior.
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If you move your watchband up your
wrist an inch or so, you will feel it for
only a few moments. This best
illustrates:
A. parallel processing.
B. accommodation.
C. sensory adaptation.
D. Weber's law.
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Which of the following activities requires
you to use the absolute threshold for
sensation?
A. telling the difference between sweet and
salty
B. detecting a tiny, faint light on a radar screen
C. deciding if two glasses contain the same
amount of water
D. telling if your guitar is in tune
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Your roommate, who has trouble
understanding Weber’s Law, asks you,
“How different do two stimuli need to be,
in order for a person to notice the
difference?” You explain that:
A. the stimuli must differ by at least ten percent.
B. the difference threshold decreases with the magnitude of the stimulus.
C. the minimum difference needed for detection depends on the type of stimulus.
D. Weber’s Law does not address this issue.
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Vision:Module 13
Objectives
– To introduce the concept of transduction and
the physical characteristics of sight and hearing
that make it possible
– To identify problems that can occur (such as
colorblind and conductive deafness)
– To understand depth cues and retinal disparity.
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Transduction In sensation, transformation of stimulus energy
into neural impulses.
Phototransduction: Conversion of light energy into neural impulses that brain can understand.
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Light Characteristics
1. Wavelength (hue/color)
2. Intensity (brightness)
3. Saturation (purity)
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Wavelength (Hue)
Hue (color): dimension of
color determined by wavelength of
light.
Wavelength the distance from the peak of one wave to the peak of the
next.
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Wavelength (Hue)
Different wavelengths of light result in different colors.
400 nm 700 nm Long wavelengths Short wavelengths
Violet Indigo Blue Green Yellow Orange Red
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Intensity (Brightness)
Intensity Amount of energy in a
wave determined by
amplitude; related to perceived
brightness.
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The Eye
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Parts of the eye
1. Cornea: Transparent tissue where light enters the eye.
2. Iris: Muscle that expands and contracts to change the size of opening (pupil) for light.
3. Lens: Focuses the light rays on the retina.
4. Retina: Contains sensory receptors that process visual information and send it to the brain
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The Lens Lens: Transparent
structure behind pupil that changes shape to focus images on the
retina.
Accommodation: The process by which the
eye’s lens changes shape to help focus near or far
objects on the retina.
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The Lens Nearsightedness: A condition in which
nearby objects are seen more clearly than
distant objects.
Farsightedness: A condition in which faraway objects are
seen more clearly than near objects.
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Retina Retina: The light-
sensitive inner surface of the eye,
containing receptor rods and cones plus
layers of other neurons (bipolar,
ganglion cells) that process visual information.
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Optic Nerve, Blind Spot & Fovea
http://www.bergen.org
Optic nerve: Carries neural impulses from the eye to the brain. Blind Spot: Point where optic nerve leaves the eye, because there are no receptor cells located here, it creates a blind spot. Fovea: Central point in the retina, around which the eye’s cones cluster.
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Photoreceptors
E.R. Lewis, Y.Y. Zeevi, F.S Werblin, 1969
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Bipolar & Ganglion Cells Bipolar cells receive messages from
photoreceptors and transmit them to ganglion cells, which form the optic nerve.
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Visual Information Processing Optic nerves connect to the thalamus in the
middle of the brain, and the thalamus to the visual cortex.
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Ganglion & Thalamic Cells Retinal ganglion cells and thalamic neurons
break down visual stimuli into small components and have receptive fields with
center-surround organization.
Action Potentials
ON-center OFF-Surround
Review of the anatomy of the eye
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Young-Helmholtz
Trichromatic Theory
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As we look at a flower, the intensity
of the color we see is related to the
light wave’s:
A. amplitude.
B. hue.
C. length.
D. placement on the spectrum.
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The eye’s “blind spot” is related to:
A. light rays focusing too far in front of the
retina.
B. light rays focusing too far behind the retina.
C. a cluster of cells around the fovea which
contains cones, but no rods.
D. an area without receptor cells where the
optic nerve leaves the eye.
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Rather than saying a person is
“colorblind,” it would be more
accurate to say that the person:
A. has a blind spot.
B. lacks red- or green-sensitive cones.
C. is experiencing an overstimulation of the
red- and green-sensitive cones.
D. has an excess of blue-sensitive cones.
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Researcher James Hixby (2001) stated,
“We can tell if a person is looking at a
shoe, a chair, or a face, based on the
pattern of their brain activity.” This
statement is relevant to:
A. sensory adaptation.
B. feature detection.
C. opponent-process theory.
D. place theory.
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Hearing: Module 14
Objectives
– Describe the three regions of the ear and outline
the series of events that triggers the electrical
impulses sent to the brain
– Contrast place and frequency theories, and
explain how they help us to understand pitch
and perception.
– Describe how cochlear implants function, and
explain shy Deaf culture advocates object to
these devices.
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The Stimulus Input: Sound Waves
Sound waves are composed of compression and rarefaction of air molecules.
Acoustical transduction: Conversion of sound waves into neural impulses in the hairs cells of the
inner ear.
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Sound Characteristics
1. Frequency (pitch)
2. Intensity (loudness)
3. Quality (timbre)
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Frequency (Pitch)
Frequency (pitch): Dimension of
frequency determined by wavelength of
sound.
Wavelength: The distance from the peak of one wave to the peak of the
next.
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Intensity (Loudness)
Intensity (Loudness):
Amount of energy in a wave
determined by amplitude relates to perceived loudness.
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Loudness of Sound
70dB
120dB
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Quality (Timbre)
Quality (Timbre): Characteristics of sound from a zither and a guitar allows the ear to distinguish
between the two.
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Overtones
Overtones: Make the distinction among musical instruments possible.
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The Ear
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The Ear Outer Ear: Pinna. Collects sounds.
Middle Ear: Chamber between eardrum and cochlea containing three tiny bones (hammer, anvil, stirrup) that concentrate the vibrations of the eardrum on the cochlea’s oval window.
Inner Ear: Innermost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs.
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Cochlea
Cochlea: Coiled, bony, fluid-filled tube in the inner ear that transduces sound vibrations to
auditory signals.
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Theories of Audition
Place Theory suggests that sound frequencies stimulate basilar membrane at specific places
resulting in perceived pitch.
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Theories of Audition
Frequency Theory states that the rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone, thus enabling us to sense
its pitch.
Sound Frequency
Auditory Nerve Action Potentials
100 Hz 200 Hz
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Hearing Loss
Conduction Hearing Loss: Hearing loss caused by damage to the mechanical system that conducts sound waves to the cochlea.
Sensorineural Hearing Loss: Hearing loss caused by damage to the cochlea’s receptor cells or to the auditory nerve, also called nerve deafness.
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Other Sense: Module 15
Objective
• To identify the functions of taste, touch/pain,
smell and vestibular senses as well as the major
components needed for them to work correctly
(topics include gate theory, pressure stimulation,
taste buds, olfactory nerve, semicircular canals
and vertigo)
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Gate-Control Theory Melzak and Wall (1965, 1983) proposed that our spinal cord contains neurological “gates” that
either block pain or allow it to be sensed. G
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Gate Control
Theory
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Pain Control Pain can be controlled by a number of therapies including, drugs, surgery, acupuncture, exercise,
hypnosis and even thought distraction.
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Endorphins and Pain
• Endorphins are the brain’s naturally
occurring opiates
• related to decreased pain perception and an
increased sense of well-being
• euphoria and the famed "runner's high."
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Adrenaline and Pain
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Taste Traditionally taste sensations consisted of sweet,
salty, sour and bitter tastes. Recently receptors for a fifth taste have been discovered called “Umami”.
Sweet Sour Salty Bitter Umami
(Fresh
Chicken) Science of Taste
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Sensory Interaction When one sense affects another sense sensory
interaction takes place. So the taste of strawberry interacts with its smell and its texture on the
tongue to produce flavor.
Lets try for ourselves!
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Smell Like taste smell is a chemical sense. Odorants enter the nasal cavity to stimulate 5 millions receptors to sense smell. Unlike taste there are many different
forms of smells.
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Smell and Memories
Brain region (red) for smell is closely
connected with brain regions (limbic system) involved with memory,
that is why strong memories are made through the sense of
smell.
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Body Position and Movement The sense of our body parts’ position and
movement is called kinesthesis. And the vestibular sense monitors the head (and body’s) position.
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Vertigo
• the feeling that you or your environment is
moving or spinning
• describes an illusion of movement
• Benign paroxysmal positional vertigo
(BPPV) is the most common form of
vertigo and is characterized by the sensation
of motion initiated by sudden head
movements or moving the head in a certain
direction
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Vertigo
• may also be caused
by inflammation
within the inner ear
(labyrinthitis),
which is
characterized by the
sudden onset of
vertigo and may be
associated with
hearing loss.
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What is umami?
A. a taste sensation for which researchers
recently discovered receptors on the tongue
B. receptors on the tongue that respond only to
bitter tastes
C. receptors on the tongue that allow us to taste
nutrients in food, such as proteins and
vitamins
D. a condition in which there is a loss of the
sensation of taste
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You are going to design an experiment to
determine whether there are special areas on
the tongue to detect the taste of sweet, or
whether the taste can be detected in all areas
of the tongue. Which of these must be done
before you can start the experiment?
A. operationally define sweet.
B. pick out subjects who like sweet tastes.
C. pick out the items that you will use for sweet tastes.
D. none of these are necessary.
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Perceptual Organization
Objectives
– To identify the major Gestalt rules and apply
those rules to everyday examples
– To analyze the use of monocular cues in art to
give the illusion of depth
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Perceptual Organization When vision competes with other senses vision
usually wins – a phenomenon called visual capture.
How do we form meaningful perceptions from sensory information?
We organize it. Gestalt psychologists showed that a figure formed a “whole” different than its
surroundings.
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Depth Perception
Visual Cliff
Depth perception enables us to judge distances. Gibson and Walk (1960) suggested that human
infants (crawling age) have depth perception. Even new born animals show depth perception.
Inner
vis
ions
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Binocular Cues
Retinal disparity: Images from the two eyes differ. Try looking at your two fingers half an inch apart
about 5 inches away. You will see a “finger sausage” as shown in the inset.
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Binocular Cues
Convergence: Neuromuscular cues. When two eyes move inward (towards the nose) to see near objects, and outward (away from the nose) to see
far away objects.
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Monocular Cues
Relative Size: If two objects are similar in size, we perceive one that casts a smaller retinal image as
farther away.
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Monocular Cues
Interposition: Objects that occlude (block) other objects tend to be perceived as closer.
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Monocular Cues Relative Clarity: Because light form distant objects passes through more air, we perceive hazy objects
as farther away than sharp clear objects.
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Monocular Cues
Texture Gradient: Indistinct (fine) texture signals increasing distance.
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Monocular Cues
Relative Height: We perceive objects higher in our field of vision as farther away.
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Monocular Cues
Relative motion: Objects closer to a fixation point move faster and in opposing direction to objects farther away from a fixation point, which move
slower and in the same direction.
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Gestalt Principles • Figure and Ground
– Similar elements (figure) are contrasted with dissimilar elements (ground)
to give the impression of a whole
• Closure
– is the tendency of ambiguous perceptual experiences to pop back and forth
unstably between two or more alternative interpretations
– Object is incomplete or the space is not completely closed
• Similarity
– Objects look similar to one another and are often perceived as a group or
pattern.
• Proximity or Contiguity
– Occurs when object are placed close together and tend to be seen as a
group
• Continuity
– Occurs when the eye is compelled to move through one object and
continue to another object
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Gestalt Principles
Figure and Ground
Real World
Applications?
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Gestalt Principles
Figure and Ground
• Application? Camouflage
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Gestalt Principles
Closure
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Gestalt Principle
Similarity
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Gestalt Principles
Proximity
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Gestalt Principles
Continuity
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Makers of 3-D movies rely most heavily
on:
A. the visual cliff.
B. the Müller-Lyer illusion.
C. retinal disparity.
D. shape constancy.
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As we perceive the environment, we use Gestalt
principles of good form to help organize things
into meaningful groups and forms. In observing a
football game on TV we are immediately able to
recognize the players as members of their
respective teams, regardless of their positions on
the field. Which Gestalt principle is most
responsible for this ability? A. closure
B. proximity
C. similarity
D. continuity
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In the same football game, we watch as a team
attempts a field goal. Since the goal posts are
distant and the time to make a decision is short, the
referee must use many perceptual cues to decide
whether the kick is good or not. One important
ability is depth perception. Which of the following
cues might be most helpful in deciding whether the
field goal is successful?
A. linear perspective
B. motion parallax
C. convergence
D. interposition
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You are an artist and you are interested in
completing a painting that gives a three-
dimensional appearance. You want to show a
beach in the foreground of the painting, people
swimming in the ocean, and sailboats in the
distance. Which perceptual principles will be most
helpful as you complete your painting?
A. binocular depth cues
B. monocular depth cues
C. Gestalt principles of proximity and continuity
D. perceptual principles only operate in “real life” situations
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You are most likely to observe the
phi phenomenon while:
A. looking at a string of Christmas tree lights
that blink quickly in succession.
B. staring at a Necker cube.
C. comparing the size of the moon while its in
the sky to its size near the horizon.
D. attempting to catch fly ball that is quickly
coming toward you.