I guessed that his inward senses — hearing, perception, cognition — were outlasting his outward skills such as moving and making sound.

我猜想，他内部的感觉——听觉、知觉、认知能力——比外部能力如移动发音更耐久。

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As well as affecting movement, some people with CP may have hearing, vision or perception difficulties or an impaired intellectual capacity.

BBC: Disabled person

Researchers found that genes relating to sensory perception, hearing and brain development showed "accelerated evolution" in all three, but particularly in humans and gorillas.

CNN: First gorilla genome map offers clues to human evolution

Recent research suggests that if left untreated, hearing loss might contribute to an acceleration in cognitive decline - relating to our understanding, reasoning and perception skills - as we age.

BBC: Viewpoint: Does deafness contribute to dementia?