Figure 1.

Relationships between rated fatigue and facial cues. The figure illustrates how high fatigue ratings were related to high ratings on hanging eyelids, red eyes, swollen eyes, and glazed eyes. High ratings of fatigue were also related to dark circles under the eyes, pale skin, and wrinkles/fine lines around the eyes, but not rash/eczema. In addition, high ratings of fatigue relate to droopy corners of the mouth and sadness, but not tense lips. The plots consist of 778-800 ratings each (40 observers rated 20 photos) on 100 mm visual analogue scales. The relationships are based on the models presented in Table 1, with the variation between observers removed (by means of Empirical Bayes estimates). Thus, all observers have been adjusted (in level) to represent an average observer.