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top-down processing
- use information acquired through experience to make sense of
sensory information - contrasted with bottom-up processing
which uses information present in the sensory stimulus
- Gregory's constructivist theory of perception emphasises
importance of top-down processing - while sensory information
is the basis for perception it is not in itself sufficient
- use existing knowledge to form perceptual hypotheses which are then checked
against sensory data - supported with visual illusions e.g. Muller-Lyer - adjusted through size constancy
- support from tests with Bete people live in jungle
with no corners show little susceptibity to illusion
- illusion explained in terms of what is in the stimulus
- suggested perceptual compromise between actual
line length and figure it is a part of
- support from tests with Bete people live in jungle
with no corners show little susceptibity to illusion
- use existing knowledge to form perceptual hypotheses which are then checked
against sensory data - supported with visual illusions e.g. Muller-Lyer - adjusted through size constancy
- importance is challenged by
Gibson's theory of direct perception
- important because it integrates
top-down and bottom-up processing in
a theory of perception
- criticized for over-estimating role of
top-down processing and underestimating
richness of sensory data
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