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To test whether atypical number development may affect other types of quantity processing, we investigated temporal discrimination in adults with developmental dyscalculia (DD). This also allowed us to test whether (1) number and time may be sub-served by a common quantity system or decision mechanisms –in which case they may both be impaired, or (2) whether number and time are distinct –and therefore they may dissociate. Participants judged which of two successively presented horizontal lines was longer in duration, the first line being preceded by either a small or a large number prime (‘1’ or ‘9’) or by a neutral symbol (‘#’), or in third task decide which of two Arabic numbers (either ‘1’, ‘5’, ’9’) lasted longer.
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