> Imagine someone who was deprived of all sensory inputs, and has only ever been fed language (speech or text) - would they be able to "understand" it?

Complete sensory deprivation is unlikely survivable:

- Pain sensation is crucial for survival (prevents injury)

- Proprioception is needed for basic motor function

- Some sensory input appears necessary for normal brain development

- Complete sensory deprivation would likely result in severe developmental issues incompatible with life

There's no documented case of a human who has lived with absolutely zero sensory input from birth or throughout their life.