Visual attention and autistic behavior in infants with fragile X syndrome.

The team watched 12-month-old babies with fragile X syndrome look at pictures while a camera tracked their eyes. They also stuck three small sensors on each baby’s chest to record heart beats. The same kids came back at 24 and 36 months so clinicians could score autism features.

The goal was simple: see if early looking time and heart-rate patterns forecast later social-communication problems.

Babies who stared longer at the pictures and showed flatter heart-rate change later had more autism traits. Shorter looks and bigger heart-rate jumps went hand-in-hand with fewer social delays.

The link showed up as early as 12 months, before parents or doctors could spot clear symptoms.

Spriggs et al. (2015) saw the same pattern in babies who later met full ASD criteria: eye interest dropped over the study period and never bounced back. E et al. now show the slide starts even earlier in fragile X, hinting at a shared attention pathway.

Geurts et al. (2008) used home videos and parent recall to find gaze problems at 6 months. The new lab data confirm those parent stories with hard numbers, moving the field from “parents say” to “cameras measure.”

Spanoudis et al. (2011) tracked adults with autism and linked less eye time to poorer face skills. The infant markers in E et al. may forecast the same lifelong social-attention style, connecting the first year to adulthood.

If you assess a baby with FXS, a five-minute eye-and-heart check can flag high autism risk before classic red flags appear. You can start turn-taking games, joint-attention drills, and parent coaching months earlier, when brain plasticity is greatest. Add a simple heart-rate monitor to your toolkit—it’s cheap, portable, and parent-friendly.