Non‐verbal and verbal judgements of length invariance by young children

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Abstract
Non-conservers in length (150) were assessed for their ability to make a non-verbal judgement of length invariance on a task employing a train-transfer design in which the stimuli were pairs of pencils. Of the children from the group who had to respond to length equality as opposed to inequality 70% made the correct invariance judgement and could characterize their choices in invariance language (e.g., same size) while still failing the standard verbal task in which such phrases were used by the experimenter. The non-conserver''s linguistic difficulty is apparently not with framing the verbal judgement but in interpreting a question which he believes must be interpreted unidimensionally in such a context of perceptual change.

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