“…Based on this categorisation, the colour combinations that could yield better task performance in visual discrimination were found to belong to the category of negative polarity (e.g., yellow on blue). Nevertheless, some research has found that positive polarity outperformed negative polarity in enhancing visual discrimination, identification, and perceived comfort (Bauer et al., 1980; Nishiyama, 1990; Snyder et al., 1990; Taptagaporn and Saito, 1990; Saito et al., 1993; Sanders and McCormick, 1993; Shieh and Lin, 2000; Wang et al., 2003; Chan and Lee, 2005; Feng et al., 2008; Mayr and Buchner, 2010; Tsang et al., 2012). For example, Shieh and Lin (2000) used a visual identification task to investigate 12 colour combinations from four colours (yellow, blue, red, and purple), half with negative polarity and half with positive polarity.…”