Psychology Chapter 1 Flashcards
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Questions and Answers

What is the Absolute Threshold?

  • The minimum stimulus energy necessary for an observer to detect a stimulus (correct)
  • The maximum stimulus energy necessary for an observer to detect a stimulus
  • The point at which a stimulus becomes unbearable
  • The threshold at which perception begins
  • What is an action in the context of perception?

    Motor activities such as moving the head or eyes and locomotion through the environment.

    What is an attended stimulus?

    The stimulus that a person is attending to at a given point in time.

    What is Bottom-up processing?

    <p>Processing in which a person constructs a perception by analyzing the information falling on the receptors.</p> Signup and view all the answers

    What are Classical psychological methods?

    <p>The methods of limits, adjustment, and constant stimuli used for measuring thresholds.</p> Signup and view all the answers

    What are Cognitive influences on perception?

    <p>How knowledge, memories, and expectations that a person brings to a situation influence his or her perception.</p> Signup and view all the answers

    What is a Difference threshold?

    <p>The minimal detectable difference between two stimuli.</p> Signup and view all the answers

    What is an Environmental stimulus?

    <p>All of the things in our environment that we can potentially perceive at a given time.</p> Signup and view all the answers

    What is Knowledge in the context of perception?

    <p>Any information that the perceiver brings to a stimulus.</p> Signup and view all the answers

    What is Magnitude estimation?

    <p>A psychophysical method in which the subject assigns numbers to a stimulus that are proportional to the subject's magnitude of the stimulus.</p> Signup and view all the answers

    What is the Method of adjustment?

    <p>A psychophysical method in which the experimenter or observer adjusts the stimulus intensity continuously until the stimulus is detected.</p> Signup and view all the answers

    What is the Method of constant stimuli?

    <p>A psychophysical method in which a number of constant stimuli with different intensities are presented repeatedly in a random order.</p> Signup and view all the answers

    What are Methods of limits?

    <p>A psychophysical method for measuring threshold in which stimuli are presented in alternating ascending and descending order.</p> Signup and view all the answers

    What is Neural processing?

    <p>Operations that transform the electrical signals within a network of neurons.</p> Signup and view all the answers

    What is Perception?

    <p>Conscious sensory experience.</p> Signup and view all the answers

    What is the Perceptual process?

    <p>A sequence of steps leading from the environment to perception of a stimulus, recognition of the stimulus, and action regarding the stimulus.</p> Signup and view all the answers

    What is the Phenomenological approach to perception?

    <p>A method of determining the relation between stimuli and perception in which the observer describes what he or she perceives.</p> Signup and view all the answers

    What is the Physiological approach to perception?

    <p>Analyzing perception by determining how a person's perception is related to physiological processes occurring within the person.</p> Signup and view all the answers

    What is Power Function?

    <p>A mathematical function of the form $P=KS^n$, where P is perceived magnitude, K is constant, S is the stimulus intensity, and n is an exponent.</p> Signup and view all the answers

    What is the Psychophysical approach to perception?

    <p>Analyzing perception by determining how a person's perception is related to stimuli in the environment.</p> Signup and view all the answers

    What is Psychophysics?

    <p>All methods are referred to as this.</p> Signup and view all the answers

    What is the Rat-man Demonstration?

    <p>The demonstration in which presentation of a 'rat-like' or 'man-like' picture influences an observer's perception of a second, which can be interpreted as a rat or man.</p> Signup and view all the answers

    What is Reaction time?

    <p>The time between presentation of a stimulus and an observer's or listener's response to the stimulus.</p> Signup and view all the answers

    What is Recognition?

    <p>The ability to place an object in a category that gives meaning.</p> Signup and view all the answers

    What is response compression?

    <p>The result when doubling the physical intensity of a stimulus less than doubles the subjective magnitude of the stimulus.</p> Signup and view all the answers

    What is response criterion?

    <p>In a signal detection experiment, the subjective magnitude of a stimulus above which the participant will indicate that the stimulus is present.</p> Signup and view all the answers

    What is response expansion?

    <p>The result when doubling the physical intensity of a stimulus more than doubles the subjective magnitude of the stimulus.</p> Signup and view all the answers

    What is Signal Detection Theory?

    <p>A theory stating that the detection of a stimulus depends on the participant's response criterion.</p> Signup and view all the answers

    What is Steven's Power Law?

    <p>A law concerning the relationship between the physical intensity of a stimulus and the perception of the subjective magnitude of the stimulus.</p> Signup and view all the answers

    What is Top-down processing?

    <p>Processing that starts with the analysis of the high-level information, such as the knowledge a person brings to a situation.</p> Signup and view all the answers

    What is Transduction?

    <p>In the senses, the transformation of environmental energy into electrical energy.</p> Signup and view all the answers

    What is Visual form agnosia?

    <p>Inability to recognize objects.</p> Signup and view all the answers

    What is Visual search?

    <p>A procedure in which a person's task is to find a particular element in a display that contains a number of elements.</p> Signup and view all the answers

    What is Weber Fraction?

    <p>The ratio of the difference threshold to the value of standard stimulus in Weber's Law, $DL/S$.</p> Signup and view all the answers

    What is Weber's Law?

    <p>A law stating that the ratio of the difference threshold ($DL$) to the value of stimulus ($S$) is constant.</p> Signup and view all the answers

    Study Notes

    Key Concepts in Perception

    • Absolute Threshold: Minimum stimulus energy required for detection by an observer.
    • Action: Motor activities such as head movements and locomotion; perceived outcomes of sensory processing.
    • Attended Stimulus: The specific stimulus a person focuses on at any given moment.

    Processing Types

    • Bottom-up Processing: Constructs perception by analyzing sensory input from receptors.
    • Top-down Processing: Begins with high-level cognitive processes, integrating knowledge and expectations into perception.

    Methods of Measuring Perception

    • Classical Psychological Methods: Techniques to measure thresholds, including the methods of limits, adjustment, and constant stimuli.
    • Magnitude Estimation: Assigning numerical values to stimuli based on perceived intensity.
    • Method of Adjustment: Observer adjusts stimulus intensity gradually until detection occurs.
    • Method of Constant Stimuli: Various constant stimuli are presented in random order to assess thresholds.
    • Methods of Limits: Stimuli are presented in alternating ascending and descending sequences to measure detection thresholds.

    Influences on Perception

    • Cognitive Influences on Perception: Knowledge, memories, and expectations shape how stimuli are perceived.
    • Environmental Stimulus: All potential stimuli in the surrounding environment at a particular time.
    • Knowledge: Information that influences perception when interacting with stimuli.

    Psychophysical Concepts

    • Difference Threshold: The smallest detectable difference between two stimuli.
    • Psychophysics: Study connecting physical stimuli to psychological responses; encompasses all methods used to explore perception.
    • Power Function (Stevens' Power Law): Describes the relationship between perceived magnitude and stimulus intensity, expressed as P=KS^n.

    Processes and Measurements

    • Neural Processing: The transformation of electrical signals within neural networks.
    • Reaction Time: The interval from stimulus presentation to response, indicative of processing speed.
    • Response Criterion: The subjective threshold within signal detection, determining when a participant signals a stimulus is present.
    • Response Compression/Expansion: Compression occurs when perceived intensity increases less than the physical intensity; expansion is the opposite.

    Perceptual Disorders and Strategies

    • Visual Form Agnosia: A condition resulting in an inability to recognize objects visually.
    • Visual Search: Task of locating a specific element among many in a display.

    Theoretical Frameworks

    • Signal Detection Theory: Proposes that detection relies on a participant's response criterion rather than just sensory input.
    • Weber's Law: States that the ratio of the difference threshold to the stimulus value remains constant across different levels.
    • Weber Fraction: This ratio (DL/S) helps quantify perception differences and thresholds relevant to Weber's Law.

    Additional Concepts

    • Transduction: Conversion of environmental energy into electrical energy within sensory systems.
    • Perceptual Process: Series of steps from stimulus detection to recognition and action.

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    Test your knowledge with these flashcards covering key terms from Chapter 1 of Psychology. Each card includes definitions of essential concepts such as absolute threshold and attended stimulus. Perfect for reinforcing your understanding of the basics of perception.

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