PSY Online Exam2
Copyright © 2010 Allyn & Bacon
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PowerPoint Presentations for
Psychology
The Science of Behavior
Seventh Edition
Neil R. Carlson,
Harold Miller, C. Donald Heth,
John W. Donahoe, and
G. Neil Martin
Prepared by Linda Fayard
Mississippi Gulf Coast Community College
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Chapter 6
Sensation
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Sensation
Sensory Processing
Vision
Audition
The Chemical Senses
The Somatosenses
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Sensory Processing
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- Transduction
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- Sensory Coding
- Psychophysics
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Sensory Coding
- The codes used by the sensory systems to transmit information to the brain
- Two general forms:
- Anatomical coding
- Temporal coding
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Psychophysics
- Studies the relationship between physical stimuli and perceptual experience
- Just Noticeable Difference (JND) – smallest difference in a stimulus that a person can detect
- Signal-detection theory – a mathematical theory of the detection of stimuli
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Figure 6.2: Hypothetical Range of Perceived Brightness (in jnds) as a Function of Intensity
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Figure 6.3: Four Possibilities in Judging the Presence or Absence of a Stimulus
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Figure 6.4: A Receiver-Operating-Characteristic (ROC) Curve
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Figure 6.5: Two ROC Curves
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Vision
- Light
- The Eye and Its Functions
- Transduction of Light by Photoreceptors
- Adaptation to Light and Dark
- Eye Movements
- Color Vision
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Light
Figure 6.6: The Electromagnetic Spectrum
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The Eye and Its Functions
Figure 6.7: A Cross Section of the Human Eye
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The Eye and Its Functions
Figure 6.7: Lenses Used to Correct Nearsightedness and Farsightedness
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Adaptation to Light and Dark
- When you enter a dark room after being in a brightly lit room or in sunlight, it takes some time to adjust your eyes to the dark.
- Dark adaptation – process of being able to distinguish dimly illuminated objects after going from a bright region into a dark one
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Transduction of Light by Photoreceptors
Figure 6.12: Transduction of Light into Neural Activity
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Eye Movements
- Conjugate movements – require both eyes to remain fixed on the same target
- Saccadic movements – abrupt shifts in gaze from one point to another
- Pursuit movements – include tracking a moving object
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Color Vision
Figure 6.14: Hue, Brightness, and Saturation
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Figure 15: Additive Color Mixing
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- Hue: related to wavelength
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- Brightness: related to intensity of light
- Saturation: related to purity
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Figure 6.16: Additive Color Mixing and Paint Mixing
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Figure 6.17: A Negative Afterimage
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Defects in Color Vision
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- Protanopia: red cones filled with green photopigment
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- Deuteranopia: green cones filled with red photopigment
- Tritanopia: lack of blue cones
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Audition
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- Sound
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- The Ear and Its Functions
- Detection and Localizing Sounds in the Environment
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Sound
Figure 6.19: Sound Waves
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Figure 6.20: The Physical and Perceptual Dimensions of Sound Waves
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The Ear and Its Functions
Figure 6.21: Anatomy of the Auditory System
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Figure 6.22: Response to Sound Waves
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Figure 6.23: The Transduction of Sound Vibrations in the Auditory System
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Detecting and Localizing Sounds in the Environment
- Pitch and loudness
- Timbre
- Perception of environmental sounds
- Locating the source of a sound
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Detecting and Localizing Sounds in the Environment
Two systems:
Low frequency – difference in arrival time
High frequency – difference in intensity
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Figure 6.26: Localizing the Source of High-Frequency Sounds
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The Chemical Senses
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- Gustation
- Olfaction
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Gustation
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- Taste Receptors and the Sensory Pathway
- The Five Qualities of Taste
- Bitterness
- Sourness
- Sweetness
- Saltiness
- Umami
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Olfaction
- Anatomy of the Olfactory System
- The Dimensions of Odor
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Figure 6.30: The Olfactory System
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The Dimension of Odor
- Humans can recognize up to 10,000 different odors
- Not yet known exactly which molecules stimulate which receptors
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The Somatosenses
- The Skin Senses
- Touch and pressure
- Temperature
- Pain
- The Internal Senses
- The Vestibular Senses
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The Skin Senses
Figure 6.32: Sensory Receptors
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Figure 6.33: The Method for Determining the Two-Point Discrimination Threshold
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The Internal Senses
- There are sensory receptors located in our internal organs, bones and joints, and muscles that convey painful, neutral, and in some cases pleasurable sensory information
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The Vestibular Senses
- Sense of balance
- Vestibular apparatus – contributes to balance and head movement
- Semicircular canal – responds to
rotational movement of head
- Vestibular sac – detects change
in the tilt of the head
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Figure 6.34: The Three Semicircular Canals and Two Vestibular Sacs in the Inner Ear