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Consistência da Sinestesia grafema-cor
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A Sinestesia Grafema-Cor (SGC) é uma condição em que grafemas (letras ou algarismos) são automaticamente associados com cores. A sua consistência é a característica comportamental clássica em volta da qual se construiu a maioria dos testes objectivos para a SGC. Nos últimos anos tem no entanto sido contestada a premissa de que toda a SGC é consistente. As formas primordiais de sinestesia da infância apresentam menos consistência que as formas adultas e esta parece desenvolver-se até à adolescência, quando terá o seu pico. É ainda possível que sinestetas adultos tenham desvios lentos nas suas cores sinestésicas, mas faltam estudos longitudinais de longo prazo que o provem. Desvios mais temporários na SGC poderão ser induzidos nos sinestetas por alterações de humor. Os estudos mais recentes têm tentado contemplar esta possibilidade nas suas análises. Finalmente, os estados sinestésicos induzidos por factores extrínsecos são também experiências sensorial trans-modais bastante populares, mas que não parecem apresentar a mesma consistência que a SGC clássica.
Grapheme-Colour Synaesthesia (GCS) is a condition in which graphemes (letters or digits) are automatically associated with colours. Consistency is the behavioural hallmark around which most objective tests of GCS were designed. Over the last few years however, the previously undisputed assumption that GCS must be consistent to be thus classified has come under fire. In this review, we present some instances where evidence has mounted against this assumption of consistency as the key criterion of GCS diagnosis. In childhood, it seems that primordial forms of synaesthesia are much less consistent that adult counterparts and that consistency is a secondary gain that occurs until adolescence, when it peaks. There is also evidence that adult synaesthetes may have slow shifts in their colour concurrents, though long term longitudinal studies will be necessary to prove this theory. More temporary drifts in GCS may be seen with mood changes in synaesthetes and recent studies have been trying to screen for this. Finally, extrinsically-induced synaesthetic states are popular instances of cross-modal experience where consistency doesn’t feature as a significant trait.
Grapheme-Colour Synaesthesia (GCS) is a condition in which graphemes (letters or digits) are automatically associated with colours. Consistency is the behavioural hallmark around which most objective tests of GCS were designed. Over the last few years however, the previously undisputed assumption that GCS must be consistent to be thus classified has come under fire. In this review, we present some instances where evidence has mounted against this assumption of consistency as the key criterion of GCS diagnosis. In childhood, it seems that primordial forms of synaesthesia are much less consistent that adult counterparts and that consistency is a secondary gain that occurs until adolescence, when it peaks. There is also evidence that adult synaesthetes may have slow shifts in their colour concurrents, though long term longitudinal studies will be necessary to prove this theory. More temporary drifts in GCS may be seen with mood changes in synaesthetes and recent studies have been trying to screen for this. Finally, extrinsically-induced synaesthetic states are popular instances of cross-modal experience where consistency doesn’t feature as a significant trait.
Descrição
Trabalho Final do Curso de Mestrado Integrado em Medicina, Faculdade de Medicina, Universidade de Lisboa, 2018
Palavras-chave
Sinestesia grafema-cor Psiquiatria