Brief Report: Early VEPs to Pattern-Reversal in Adolescents and Adults with Autism.

Lim et al. (2016) hooked 25 teens and adults with autism and 25 typical peers to EEG caps.

Everyone watched black-and-white checkerboards flip back and forth for six minutes.

The team measured the P100, the first big visual brain wave that peaks about 100 ms after a flip.

The autism group showed P100 waves that were half the height of the control group.

Even though the task was passive—no talking, no choices—the brain’s early visual gain was turned down.

Lower amplitude means the visual system gave a weaker first reply to the same stimulus.

Kemner et al. (2008) seems to say the opposite: adults with autism search visual scenes faster and with fewer eye moves.

The studies don’t conflict. K’s task tested raw brain gain; Chantal’s tested active hunting. A weak early response can still pair with sharp discrimination when the person tries.

Boudreau et al. (2015) used the same EEG gear and found autism adults update oddball probabilities late, not early. Together the papers trace a timeline: low visual gain first, then quirky attentional weighting seconds later.

Rosenthal et al. (1980) saw damp heart-rate and skin-conductance to sounds in autistic kids. K et al. now show the dampening also hits the visual channel, hinting at a cross-modal physiological quieting.

If the brain’s first visual step is soft, don’t expect clients to pick up subtle visual cues right away. Use brighter, slower, or repeated stimuli during discrimination training and give the learner extra time before prompting a response.