There are special neurons that are responsible for this. They mark the boundaries of events in the memory stream. Then these boundaries become a stronghold.
A recent study confirmed this with staff from the Cedars-Sinai Medical Centre, University of Toronto, and Harvard. Nineteen people with epilepsy awaiting brain surgery participated in this study. They were shown a video comprising of events that either slowly faded over each other or ended abruptly. The videos mimicked real-life events. It was discovered that the abrupt ending recollections were read by the brain as the boundaries of events and were marked by all neurons. And the events preceding the beginning and the end of new episodes were perfectly replicated by memory. However, scientists have yet to respond accurately to what affects this neuron activity.
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