Inhibitory mechanisms in Down syndrome: is there a specific or general deficit?

Borella et al. (2013) asked a simple question. Do people with Down syndrome struggle with one kind of self-control, or with all kinds?

They gave a mixed-age group several inhibition games. Each game asked players to ignore something tempting or distracting. The team also checked working memory. They compared scores to mental-age-matched peers without Down syndrome.

Down syndrome meant lower scores on every inhibition task. Working memory scores were lower too.

The gap showed up across the board, not just on one tricky game. The authors call this a general inhibitory deficit.

Micai et al. (2021) pooled many studies and found the same small, steady inhibition gap. Their meta-analysis includes the 2013 data, so the two papers agree.

Kaufman et al. (2010) looked at teens with Down syndrome three years earlier. They also saw wide executive-function problems. The 2013 study narrows the focus to inhibition but keeps the same negative picture.

Soltani et al. (2025) push the story forward. They show that poor inhibition and working memory in youth with Down syndrome predict later rule-breaking and inattention. The 2013 deficit is not just lab noise; it matters for real-life behavior.

If you write plans for learners with Down syndrome, assume extra help is needed any time they must ignore distractions, stop an action, or hold two rules in mind. Break tasks into tiny steps, cut visual clutter, and pre-teach stop-and-wait routines. These small changes target the broad inhibitory weakness shown here and confirmed by later work.