Answer: Sensory memory
Step-by-step explanation:
Sensory memory is the memory that works through sensory receptors for processing any form of sensation received from seeing, hearing, touch, smell or taste.It is considered to occur for short period in which sensory information imprint is retained when the actual stimuli gets out of scenario
According to the question, even when flashbulb went off ,the flash stroked blue dots in the sight where-ever the person sees.This signifies sensory memory is working in this situation where flashbulb is the actual stimuli has ended by effect stays in sight sense for short term.