Which memory system holds sensory impressions for a very short period?

Sensory memory is indeed the correct answer as it serves to hold sensory impressions from the environment for a very brief duration. This system allows individuals to retain an exact copy of sensory stimuli, such as sights and sounds, just long enough for initial processing. The duration of sensory memory is typically only a fraction of a second to a few seconds, depending on the type of sensory input.

This system acts as a sort of buffer for incoming information, storing it momentarily before it either fades away or is transferred to short-term memory for further processing. Understanding sensory memory is crucial as it highlights the initial stage of memory processing, distinguishing it from short-term memory, which involves active manipulation and holds information for a longer duration, typically around 20 to 30 seconds. Long-term memory, on the other hand, stores information for extended periods, while working memory pertains specifically to the active maintenance and manipulation of information currently being processed.