Answer:
echoic memory
Explanation:
According to my research on studies conducted by various neurologists, I can say that based on the information provided within the question this is caused by a specific type of sensory memory called echoic memory. This type of memory is when memory registers after a specific auditory sound is triggered as an initial stimuli. Since this type of stored information cannot be scanned repeatedly like visual memory it sometimes has a delayed reaction period like exhibited in this scenario.
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