Diminished sensitivity to sad facial expressions in high functioning autism spectrum disorders is associated with symptomatology and adaptive functioning.

Matson et al. (2011) showed teens with high-functioning ASD photos of sad faces. They asked the teens to pick the emotion. They also rated each teen's real-life social skills.

The team compared the ASD group to typical teens. They wanted to know if trouble reading sad faces links to worse daily living skills.

The ASD teens needed much stronger sad faces before they noticed the emotion. The worse the sadness blindness, the more autism symptoms and the lower the daily living scores.

In plain words: missing subtle sad faces predicts bigger social struggles.

Liu et al. (2023) saw the same sadness gap in younger kids, but they measured facial mimicry instead of perception. Together the papers show the sadness problem sits at two levels: teens don't see it and kids don't copy it.

Kuusikko et al. (2008) and Kasari et al. (2011) already showed these teens feel more social anxiety and sit on the edge of classroom networks. Matson et al. (2011) gives a reason: they literally miss sad cues that glue typical friendships together.

Schwartz et al. (2010) found high-functioning adults also shrug off other non-verbal cues. The sadness result is not a one-off; it is part of a life-long pattern of 'tuning out' subtle social signals.

If a client with ASD seems clueless when a peer looks disappointed, it may not be lack of empathy. The face simply never registered. You can build success by making sad faces extra clear, teaching the student to scan for downturned mouths, and giving peers cue cards with exaggerated expressions. Small visual boosts can close real-world social gaps.