Fig 1.
Example stimuli when gaze is direct or averted for a face with light irises for the daytime and nighttime stimuli.
The man in the stimuli below gave informed consent for his photograph to be used for scientific purposes [30]. Reprinted from [30] under a CC BY license, with permission from Siri Leknes, original copyright 2014.
Fig 2.
Example of array used in the search task for the Target Directed Natural set at nighttime.
The man in the stimuli below gave informed consent for his photograph to be used for scientific purposes [30]. Reprinted from [30] under a CC BY license, with permission from Siri Leknes, original copyright 2014.
Fig 3.
The (a) latency to initially fixate the target, (b) latency to indicate choice (via key press) after initially fixating the target, and (c) percentage of correct responses for large and upright faces, small and upright faces, and large and inverted faces for the daytime and nighttime stimuli.
Means and standard errors are shown; horizontal lines indicate planned comparisons that were statistically significant.
Table 1.
The effect of block, set, treatment, iris color, age and gender on the latency to fixate the target and latency to press a key after fixating the target.
Table 2.
The effect of block, set, treatment, iris color, age and gender on the percentage of correct responses.