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Sensation and Perception CH<strong>AP</strong>TER 4 KEY TERMS Transduction Sensory adaptation Sensory habituation (also called perceptual adaptation) Cocktail-party phenomenon Sensation Perception Energy senses Chemical senses Vision Cornea Pupil Lens Retina Feature detectors Optic nerve Occipital lobe Visible light Rods and cones Fovea Blind spot Trichromatic theory Color blindness Afterimages Opponent-process theory Hearing Sound waves Amplitude Frequency Cochlea Pitch theories Place theory Frequency theory Conduction deafness Nerve deafness Touch Gate-control theory Taste (or gustation) Smell (or olfaction) Vestibular sense Kinesthetic sense Absolute threshold Subliminal messages Difference threshold Weber’s law Signal detection theory Top-down processing Perceptual set Bottom-up processing Gestalt rules
Proximity Similarity Continuity Closure Constancy Size constancy Shape constancy Brightness constancy Depth cues KEY PEOPLE David Hubel Torsten Wiesel Ernst Weber Gustav Fechner Eleanor Gibson OVERVIEW Right now as you read this, your eyes capture the light reflected off the page in front of you. Structures in your eyes change this pattern of light into signals that are sent to your brain and interpreted as language. The sensation of the symbols on the page and the perception of these symbols as words allow you to understand what you are reading. All our senses work in a similar way. In general, our sensory organs receive stimuli. These messages go through a process called transduction, which means the signals are transformed into neural impulses. These neural impulses travel first to the thalamus then on to different cortices of the brain (you will see later that the sense of smell is the one exception to this rule). What we sense and perceive is influenced by many factors, including how long we are exposed to stimuli. For example, you probably felt your socks when you put them on this morning, but you stopped feeling them after a while. You probably stopped perceiving the feeling of your socks on your feet because of a combination of sensory adaptation (decreasing responsiveness to stimuli due to constant stimulation) and sensory habituation (our perception of sensations is partially due to how focused we are on them). What we perceive is determined by what sensations activate our senses and by what we focus on perceiving. We can voluntarily attend to stimuli in order to perceive them, as you are doing right now, but paying attention can also be involuntary. If you are talking with a friend and someone across the room says your name, your attention will probably involuntarily switch across the room (this is sometimes called the cocktail-party phenomenon). These processes are our only way to get information about the outside world. The exact distinction between what is sensation and what is perception is debated by psychologists and philosophers. For our purposes, though, we can think of sensation as activation of our senses (eyes, ears, and so on) and perception as the process of understanding these sensations. We will review the structure and functions of each sensory organ and then explain some concepts involved in perception. TIP One of the ways to organize the different senses in your mind is by thinking about what they gather from the outside world.
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A 1 E=mc 2 This eBook is downloaded
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About the Authors Allyson Weseley h
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Perception Practice Questions 5 Sta
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13 Treatment of Psychological Disor
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The College Board recently revised
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Overview of the AP Psychology Exam
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(A) negative reinforcement. (B) sha
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(B) 2 years (C) 4 years (D) 8 years
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(A) damage to her fovea. (B) place
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(A) humanistic. (B) sociocultural.
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48. In the past when Nuara’s comp
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(E) central 59. Which part of the b
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(D) 82 (E) 95 70. The typical age o
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(C) idiographic (D) sociocultural (
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(C) long-term memory. (D) echoic me
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Answer Key DIAGNOSTIC TEST 1. B 36.
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necessarily related to being creati
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uses magnetic fields to show both s
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the high school students taking AP
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when people’s preexisting beliefs
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of the trials but simply not had an
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76. (C) Group therapy tends to be l
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89. (D) The prefrontal cortex plays
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MULTIPLE-CHOICE ERROR ANALYSIS SHEE
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QUESTION 1 SCORING RUBRIC This is a
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eal-world violence” as the variab
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attention determines what informati
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Also, notice that this (fictional)
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History and Approaches CHAPTER 1 KE
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epression—the pushing down into t
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Page 72 and 73: Coercion Informed consent Anonymity
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Page 84 and 85: In both cases, you would be correct
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Page 92 and 93: Biological Bases of Behavior CHAPTE
Page 94 and 95: Terminal buttons (also called end b
Page 96 and 97: Afferent Neurons (or Sensory Neuron
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Page 100 and 101: An electroencephalogram (EEG) detec
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Page 106 and 107: of each retina are processed in the
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Page 110 and 111: (E) neurons, synapses, and cerebral
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Page 118 and 119: enough bipolar cells fire, the next
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Page 122 and 123: CHEMICAL SENSES Taste (or Gustation
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Page 126 and 127: Perceptual Theories Psychologists u
Page 128 and 129: Figure 4.5. Optical illusion. Gesta
Page 130 and 131: Depth Cues One of the most importan
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Page 138 and 139: OVERVIEW While you are reading this
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Page 144 and 145: Researcher Ernest Hilgard explained
Page 146 and 147: Practice Questions Directions: Each
Page 148 and 149: 12. In the context of this unit, th
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Page 154 and 155: esponse to the white rat. Aversive
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(B) aversive conditioning. (C) simu
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1. (B) The music before a scary eve
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important point: the word positive
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Functional fixedness Confirmation b
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with one person at a party but then
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One factor is the order in which th
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memory, is stored elsewhere in the
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THINKING AND CREATIVITY Describing
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very different than what the design
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(D) The words in each language affe
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(C) a child of normal mental abilit
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14. (C) The critical-period hypothe
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OVERVIEW In my psychology class, I
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motivation to return to the baselin
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hypothalamus act in opposition to c
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Sexual Response Cycle The famous la
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esponds best to can give managers a
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Schachter showed that people who ar
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Practice Questions Directions: Each
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(B) decreased motivation to perform
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equally active in work groups and m
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Konrad Lorenz Harry Harlow Mary Ain
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MOTOR/SENSORY DEVELOPMENT Reflexes
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MARY AINSWORTH Mary Ainsworth resea
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Sigmund Freud Historically, Freud w
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Integrity versus despair Toward the
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Formal operations (12 through adult
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During the next level of moral reas
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etween the sexes. However, biopsych
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(A) teratogens. (B) stress on the m
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(E) authoritative 15. Which of the
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Personality CHAPTER 10 KEY TERMS Pe
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Both the Oedipus and Electra crises
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• Biff continues to act as if he
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Impact of Freudian Theory Despite i
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BIOLOGICAL THEORIES Biological theo
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HUMANISTIC THEORIES Many of the mod
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psychologists, particularly cogniti
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(C) identifying core principles by
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7. (C) Dr. Li is using the TAT (the
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Testing and Individual Differences
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same person, it clearly does not ac
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Charles Spearman One fundamental is
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created a test that would identify
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NATURE VERSUS NURTURE: INTELLIGENCE
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12. Although her score on the perso
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7. (C) Spearman argued that intelli
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Abnormal Psychology CHAPTER 12 KEY
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Disorders (DSM). Periodically, this
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a situation in which one could emba
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Dissociative identity disorder (DID
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A growing body of evidence suggests
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• Parkinson’s disease, characte
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Paraphilias or psychosexual disorde
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(C) cognitive (D) behavioral (E) so
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psychologists would locate the caus
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Albert Ellis OVERVIEW Just as there
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of Consciousness,” is an altered
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the doctor’s office. His mother m
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suffering from a social phobia migh
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The most intrusive and rarest form
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2. Coretta’s therapist says littl
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(B) client-centered (C) aversive co
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9. (B) Transference is when patient
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Stanley Milgram Irving Janis Philli
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already said that the boring task w
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attribution error. Say that you go
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Origin of Stereotypes and Prejudice
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that good-looking people are percei
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TABLE 14.1 Group polarization is th
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(C) modeling. (D) diffusion of resp
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14. On the first day of class, Mr.
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error is a different attributional
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Here’s another example: A psychol
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(E) Table manners are learned by re
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Answering Free-Response Questions C
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6. When asked about a psychological
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INTERPRETING THE RUBRIC Notice how
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Point 4 — Not awarded—The stude
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(E) PTSD. 5. Which psychological pe
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(A) social facilitation (B) deindiv
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(B) contextual intelligence (C) div
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34. Which of the following statisti
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(E) adult genital stage. 45. Daniel
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(D) the fundamental attribution err
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64. Matt’s research design could
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(C) the social role hypothesis. (D)
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(A) social facilitation. (B) confor
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(D) James-Lange theory (E) opponent
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Answer Key PRACTICE TEST #1 1. D 36
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6. (C) Pascale would best be classi
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18. (B) Counterconditioning lies at
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29. (E) Of the disorders listed, ma
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40. (E) Jamie’s printer problems
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ethics. People with low self-esteem
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take the energy from impulses they
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Genna’s right hemisphere was dama
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SSRIs (serotonin selective reuptake
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effect would not be particularly he
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Question 1 Scoring Rubric This is a
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Part B Point 4 — Yerkes-Dodson la
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(A) hearing (B) touch (C) balance (
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(A) proximity and similarity (B) to
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(C) primary (physical) and secondar
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(C) unconditional positive regard (
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(E) Dreams reflect variations in br
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(C) median (D) mean (E) normal curv
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(B) semantic memory (C) procedural
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(D) disorganized, paranoid, cataton
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(C) Operant conditioning is used to
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(B) to explain the biomedical sympt
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Answer Key PRACTICE TEST #2 1. C 36
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nondamaged parts of the brain and r
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28. (D) Stimulation of the lateral
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48. (A) Psychotherapies all involve
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67. (D) Generalization occurs in cl
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hybrid cars” and “don’t own h
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Multiple-Choice Error Analysis Shee
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Point 3 — Students need to briefl
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SAMPLE STUDENT RESPONSE ESSAY 2 SCO
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