Four groups of Ss were exposed to a probability-learning task in which they were to guess which of two stimuli would appear. The stimuli were either pictures of angry or smiling faces which were either distinctively white or Negro in appearance. When the input ratio was 70% angry to 30% smiling faces, Ss underestimated the dominant input. When the input ratio was reversed (70% smiling, 30% angry), expectancies for dominant stimulus more closely approximated the input ratio. Racial cues were not a determinant for choice responses even though such cues were apparently highly visible for most Ss.
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