Pearson Edexcel · GCSE · Psychology

    Course version: 1PS0 · Version from Sept 2017

    Understand the Constructivist Theory of Perception (Gregory, 1970) as an…

    Full specification wording

    Perception: 8.1.3 Understand the Constructivist Theory of Perception (Gregory, 1970) as an explanation of sensation and perception, including strengths and weaknesses of the theory: a. sensory input b. perceptual hypothesis c. inferences d. prior knowledge

    Gregory (1970) proposed that perception is an active, constructive process.

    Checked against the Pearson Edexcel 1PS0 specification (opens in a new tab) on .

    • Point 3 of 4
    • 4 key terms

    Study notes

    From the checked teaching notes for this specification point.

    The idea

    Gregory (1970) proposed that perception is an active, constructive process. Sensory input from the environment is often incomplete or ambiguous. To make sense of this, the brain uses prior knowledge and past experiences to make inferences about what is being perceived. This results in a perceptual hypothesis—a best guess about the sensory information. For example, seeing a partially obscured shape in the dark, your brain infers it is a chair based on prior knowledge. Strengths include its ability to explain visual illusions where our hypotheses are incorrect. However, a weakness is that it struggles to explain how perception occurs in newborns who lack prior knowledge, suggesting some aspects of perception must be innate rather than learned.

    What earns the marks

    • Identifies that sensory input is often incomplete and requires interpretation.
    • Explains that the brain makes inferences based on prior knowledge and past experience.
    • Defines a perceptual hypothesis as the brain's best guess about ambiguous sensory information.
    • Evaluates the theory by citing its success in explaining visual illusions as incorrect hypotheses.
    • Evaluates the theory by noting its failure to explain innate perceptual abilities in infants.

    Common mistakes and how to put them right

    • Confusing sensation with perception.

      Put it right: Sensation is the physical detection of stimuli, whereas perception is the brain's interpretation of it.

    • Assuming perceptual hypotheses are always correct.

      Put it right: Visual illusions demonstrate that our brain's inferences can sometimes lead to incorrect perceptions.

    • Believing Gregory's theory supports innate perception.

      Put it right: Gregory's constructivist theory relies on learned prior knowledge, contrasting with theories of innate perception.

    Exam tips

    • Use the term 'perceptual hypothesis' when describing how the brain makes a 'best guess' about ambiguous stimuli.
    • Link the concept of 'inferences' directly to the use of 'prior knowledge' and past experiences.
    • When evaluating, contrast Gregory's reliance on learning with evidence of innate perception in infants to provide a clear weakness.

    Try the lesson

    The start of the Perception: 8.1.3 Understand the Constructivist Theory of Perception (Gregory, 1970) as an explanation of sensation and perception, including strengths and weaknesses of the theory: a. sensory input b. perceptual hypothesis c. inferences d. prior knowledge lesson, made from checked teaching notes for this specification point.

    Have a go first

    According to Gregory's constructivist theory of perception, what is meant by a 'perceptual hypothesis'?

    Listen

    Gregory (1970) proposed that perception is an active, constructive process. Sensory input from the environment is often incomplete or ambiguous. To make sense of this, the brain uses prior knowledge and past experiences to make inferences about what is being perceived. This results in a perceptual hypothesis—a best guess about the sensory information. For example, seeing a partially obscured shape in the dark, your brain infers it is a chair based on prior knowledge. Strengths include its ability to explain visual illusions where our hypotheses are incorrect. However, a weakness is that it struggles to explain how perception occurs in newborns who lack prior knowledge, suggesting some aspects of perception must be innate rather than learned. A strong answer earns marks for these points. Identifies that sensory input is often incomplete and requires interpretation. Explains that the brain makes inferences based on prior knowledge and past experience. Defines a perceptual hypothesis as the brain's best guess about ambiguous sensory information. Evaluates the theory by citing its success in explaining visual illusions as incorrect hypotheses. A common slip: Confusing sensation with perception. Instead, sensation is the physical detection of stimuli, whereas perception is the brain's interpretation of it. Exam tip: Use the term 'perceptual hypothesis' when describing how the brain makes a 'best guess' about ambiguous stimuli.

    See it

    A top-down flowchart. Sensory input leads to the note that it is incomplete or ambiguous. This leads to prior knowledge and past experience, which leads to inferences, then to a perceptual hypothesis, then to perception. From the perceptual hypothesis a branch goes to visual illusions as an incorrect hypothesis. From prior knowledge and past experience another branch goes to the weakness that newborns lack prior knowledge.
    Shows Gregory's constructivist process from sensory input through prior knowledge and inferences to a perceptual hypothesis, with a strength and a weakness.

    Key words

    Say what each word means before you turn the card.

    Sensation and perception

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    Perceptual hypothesis

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    Inferences

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    Prior knowledge

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    See every definition
    Sensation and perception
    Sensation is the physical detection of stimuli, whereas perception is the brain's interpretation of it.
    Perceptual hypothesis
    The brain's best guess about ambiguous sensory information.
    Inferences
    Conclusions the brain makes about what is being perceived, based on prior knowledge and past experiences.
    Prior knowledge
    Past experiences that the brain uses to make inferences about incomplete or ambiguous sensory input.

    Label the diagram

    Some boxes have lost their names. Pick the right name for each number.

    The diagram again, with 3 boxes numbered instead of named. A top-down flowchart. Sensory input leads to the note that it is incomplete or ambiguous. This leads to prior knowledge and past experience, which leads to inferences, then to a perceptual hypothesis, then to perception. From the perceptual hypothesis a branch goes to visual illusions as an incorrect hypothesis. From prior knowledge and past experience another branch goes to the weakness that newborns lack prior knowledge.

    • 1Box 1

    • 2Box 2

    • 3Box 3

    0 of 3 labelled

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