Riddoch and Humphreys’ model (1987) distinguish three levels of objects’ representations: structural, semantic and lexical.

In this specific work we investigate the place of the colour in object’s representations. We compare response times in three different tasks (object decision task, chromatic decision and categorial decision) which are supposed to activate the level of structural representations for the object decision and semantic for the categorial decision.

According to Riddoch and Humphreys’ model (1987), we predict faster reaction times for the objects decision than for the semantic one.

The colour being able to belong at the same moment to structural and semantic level (respectively under analogical form or propositional), we think that the analysis of response times could give us a first indication on the place of the colour.

The results would be analysed with regard to both approaches: Riddoch and Humphreys’ model (1987) and the Hierarchical Interactive Theory (Humphreys & Forde, 2001).