This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...� is a group of sensations automatically retained and integrated by the brain of a living organism, which gives it the ability to be aware, not of single stimuli, but of entities, of things. An animal is guided, not merely by immediate sensations, but by percepts. Its actions are not single, discrete responses to single, separate stimuli, but are directed by an integrated awareness of the perceptual reality confronting it. It is able to grasp the perceptual concretes immediately present and it is able to form automatic perceptual associations, but it can go no further. It is ...
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