It is hard, perhaps even impossible, to define normal sensory perception.

All sensory pleasures activate the minds of the noble-natured. They shut down the minds of the unnoble.

What if we all are brains in vats and every sensory perception is illusionary?

Since Tom arrived at Guantanamo Bay he has been exposed to different forms of torture: sleep deprivation, sensory deprivation, extreme temperatures, prolonged isolation, lack of sunlight and limited health care.

This means that our perception of any situation depends only partly on sensory signals being received at that time.

Tentacles usually occur in pairs, sometimes with both sensory and manipulatory functions.