A set of 480 colour photographic pictures standardised for Thai: A new resource for cognitive and psycholinguistic research

Selecting suitable stimuli for investigations into cognitive processes in memory and language is a difficult yet important process, given the natural variability for words and pictures on psycholinguistic dimensions such as concept familiarity, frequency of occurrence in the language, and name length. These attributes can influence behavioural performance in experimental tasks confounding interpretations of results. Normative databases are vitally important and help maintain the necessary level of control over psycholinguistic dimensions when selecting stimuli for experimental purposes. Although norms exist for several different languages, none are currently available for Thai. The purpose of the present research, therefore, was to standardise a large set of colour photographic images of common objects for Thai speakers. The 480-item BOSS (Brodeur, Dionne-Dostie, Montreuil, & Lepage, 2010) was rated by 584 Thai university students on seven psycholinguistic dimensions: name agreement, category agreement, image agreement, visual complexity, object familiarity, age of acquisition, and manipulability (ease of grasping & ease of miming). It is anticipated that the Thai psycholinguistic database will serve as a much-needed resource for researchers working in the fields of cognition, psycholinguistics, and neuropsychology.