The behaviour of the brother, pretending to listen but not actually listening and focused elsewhere but asking him to repeat what the speaker said is likely due to echoic behaviour. Although he is able to repeat the last few words.
When verbal conduct is in point-to-point correspondence with the verbal stimulus before it, it is said to be echoic. It's a verbal imitation of what comes right before it, or an "echo," to use laypeople's parlance. There are various behaviour analytic procedures that employ echoics to teach other verbal behaviours like manding, intraverbals, and tacting! The capacity to echo words is a key skill in early language learning.
A verbal action that shares point-to-point correspondence with the vocal-verbal stimulus that inspires it is known as an echoic reaction.
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