Perceiving Similarity and Comprehending Metaphor

Abstract

We conducted a series of 3 experiments to assess the comprehension of 4 types of cross-modal (synesthetic) similarities in nearly 500 3.5-13.5-year-old children and more than 100 adults. We tested both perceptual and verbal (metaphoric) modes. Children of all ages and adults matched pitch to brightness and loudness to brightness, thereby showing that even very young children recognize perceptual similarities between hearing and vision. Children did not consistently recognize similarity between pitch and size until about age 11. This difference in developmental timetables is compatible with the view that pitch-brightness and loudness-brightness similarities are intrinsic characteristics of perception (characteristics based, perhaps, on common sensory codes), whereas pitch-size similarity may be learned (perhaps through association of size with resonance properties). In a parallel verbal task, even 4-year-old children showed at least some capacity to translate meanings metaphorically from one modality to another (e.g., rating "low pitched" as dim and "high pitched" as bright). But not all literal meanings produced metaphoric equivalents in the youngest children (e.g., rating "sunlight" brighter but not louder than "moonlight"). Improvements with age in making metaphoric translations of synesthetic expressions paralleled increasing differentiation of meanings along literal dimensions and increasing capacity to integrate meanings of components in compound expressions. We postulate that perceptual knowledge about objects and events is represented in terms of locations in a multidimensional space; cross-modal similarities imply that the space is also multimodal. Verbal processes later gain access to this graded perceptual knowledge, thus permitting the interpretation of synesthetic metaphors according to the rules of cross-modal perception.

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