The very first -- and most ephemeral -- stage of memory happens before much conscious awareness of a stimulus. This video introduces sensory memory, including the classic work by Sperling using a clever partial report procedure.
This is a lecture video for a university course in Cognitive Psychology taught by Dr. Brian W. Stone. You may wish to play it at x1.25 speed. As with anything taught at the undergraduate level the information here may be simplified, and at higher levels of study there is more nuance to all of it.
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