Sensory Memory
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Sensory memory is the least memorable of the three types of memory. Lasting at most four seconds, sensory memory acts as the translator for the brain from seeing, hearing, or touching something and storing it within the brain. It comes in three different forms: echoic, iconic, and haptic, all of which vary in length. Echoic memory, memory for aural stimuli, lasts between 3 or 4 seconds before either decaying or being transferred into the short-term memory. Iconic memory, memory for visual stimuli, is significantly shorter, lasting between 200 and 500 milliseconds. Haptic memory, memory for physical stimuli, is between the two in length, lasting an average of 2 seconds.