Atypical brain responses to reward cues in autism as revealed by event-related potentials.

Kohls et al. (2011) watched kids’ brain waves while they waited for rewards. They showed social cues, like a smiling face, and money cues, like a coin. Then they measured the P3 wave, a brain spark that shows if the child expects something good.

All kids had autism. The team wanted to know if the reward spark was weaker for social cues only, or for every kind of reward.

The P3 wave was small for both faces and money. The brain did not perk up for either reward type. The problem is not social-only; it is a broad reward anticipation deficit.

Falcomata et al. (2012) looked at the same contrast one year later. They also found dampened brain response to money, but saw extra amygdala activity to faces. The two studies seem to clash: Gregor says “all rewards feel flat,” S says “social rewards feel intense.” The gap is method. Gregor used scalp ERP; S used fMRI that picks up deeper limbic sparks. Flat P3 and hot amygdala can coexist—one shows late expectation, the other early emotion.

Yang et al. (2026) later confirmed the broad problem. In big samples they saw over-wired reward circuits that still link to social symptoms. Their graph-theory result keeps Gregor’s main idea alive: the whole reward system is off, not just the social corner.

Haring et al. (1988) first noticed tiny P3 waves in autism, but with speech sounds. Gregor widened the lens from language to rewards, showing the same dampened spark appears whenever something good is coming.

If the brain under-reacts to all rewards, do not bank on praise or stickers alone. Mix in movement, light, sound, or edible items. Watch the child’s response trial-by-trial and swap reinforcers often. A broader toolbox keeps motivation high and sessions fun.