Some children with CAS may perform adequately in which of the following tasks?

Children with Childhood Apraxia of Speech (CAS) may demonstrate adequate performance in tasks that do not heavily rely on the planning and execution of speech movements. Rapid protrusion and retraction of the tongue falls into the category of motor function that is more reflexive and does not involve the complex neural processes required for speech production.

In tasks that require precise coordination of speech-related articulatory movements, such as reading aloud or humming tunes, children with CAS may struggle. These activities require the simultaneous planning and execution of several sequential movements, which can be challenging for them. Similarly, while using sign language could be an effective communication method for some children, it typically requires a level of fine motor control and cognitive processing that may be impacted by CAS.

Thus, rapid tongue movements are less likely to be affected by the same motor planning difficulties that characterize CAS, allowing those children to perform these movements adequately.