This document discusses the topic of sensation and perception. It defines sensation as the simplest form of cognition and the elementary raw material of our knowledge, originating from stimulation of the sense organs. It describes the different types of sensation including organic, motor/kinaesthetic, and special sensation. It outlines the key attributes of sensation such as quality, intensity, extensity, duration, and localization. It also explains several laws of sensation including similarity, proximity, closure, and continuity. In conclusion, sensation is presented as the basic building block of human knowledge and experience, governed by physiological and psychological principles.