The role of timing in testing nonverbal IQ in children with ASD.

The team gave kids with autism two IQ tests. One test had strict time limits. The other let kids work until they finished.

They wanted to see if the clock changed the score.

Kids scored lower on three out of five timed subtests. The same kids looked smarter on the untimed test.

Their final IQ label dropped just because a stopwatch was running.

Mouga et al. (2016) saw the same dip in Processing Speed and Coding scores. Their data say the weak spots stay weak no matter what.

Nader et al. (2016) swapped the old WISC-III for the newer WISC-IV and still found lower scores. They added Raven’s Matrices and watched the scores jump, proving the problem lives on in the latest test.

Wormald et al. (2019) moved to Italy and used the motor-free Leiter-3. Again, kids with autism scored higher when timing pressure vanished. The pattern crosses countries and languages.

McGonigle et al. (2014) built a brand-new timed visual game. Two-thirds of high-functioning youth slowed down under time pressure, showing the issue is bigger than any one test.

If you test a learner with autism, drop the timer or pick an untimed battery. A lower score can lock them out of gifted classes or intensive behavior plans they can actually handle. Give them the full time and you will see what they truly know.