Researchers at the Hokkaido University in Japan conducted experiments to rate how simple nodding and head shaking affects perceived trait impressions.
Short video clips of computer-generated figures nodding, shaking their head or staying motionless were shown to 49 men and women aged 18 years or older.
The participants then rated the figures' attractiveness, likeability and approachability on a scale of 0 to 100, according to the study published in the journal Perception.
The researchers found the likeability and the approachability of the nodding figures was about 30 per cent higher and 40 per cent higher respectively than that of figures shaking their heads or staying motionless.
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