Iconic memory generally lasts only a few tenths of a second, whereas echoic memory lasts 3 or 4 seconds. Though their lasting time varies, both are a type of sensory memory, which momentarily holds input from our senses before it is encoded in short-term memory.
The iconic memory is the storehouse for pictorial memory that permits individuals to envision an image even after the physical stimulus is no longer present.
While the echoic memory is an ultra short term memory for the things we hear. They prevail lengthier than iconic memory because what you have in the basilar membrane vibrating in your cochlea.
More about sensory memory:
brainly.com/question/3138534
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