Ink colours as task-irrelevant information decrease memory accuracy with the Associative Memory Stroop Task

Previous research by Hazan-Liran & Miller (2017) developed a new Stroop-like task to examine how ink colours as task-irrelevant information affects paired-associate learning (see also Miller, Hazan-Liran, & Cohen, 2018). The task was to learn word-number pairs (e.g. blue-5) whilst only numbers were coloured in either congruent ink colours (e.g. number 5 printed in blue ink), incongruent ink colours (e.g. 5 printed in brown ink) or neutral ink colours (e.g. 5 printed in black ink). The present paper refers to this task as the Associative Memory Stroop Task (AMST). Hazan-Liran & Miller (2017) found that incongruent ink colours interfere and congruent ink colour facilitate the speed of learning word-number pairs. The present experiments employed the AMST to examine the effects of irrelevant ink colours (with colour names) on memory accuracy in cued recall and associative recognition. Memory impairment was found with incongruent ink colours on both memory tests whilst improved memory accuracy with congruent ink colours was not reliable. We discuss possible explanations for these findings.