Four color palettes (yellow, green, blue and red) were observed under two different types of lamp and two different illuminances and these were ranked in order according to six bipolar semantic differential scales
including bright-dim and clear-hazy, essentially a four-alternative forced-choice task.
In Phase 2 participants completed the semantic differential scales and feeling thermometers.
Participants completed the six semantic differential scales for old people and the other six for young people.
Semantic differential scales were scored by averaging the six items for old and then the six items for young to create two indices, in which higher scores indicated more favorable attitudes.
The IRAP showed a bias toward young people, as did the semantic differential scales.