Oddly Wired
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memory

Your brain fills in gaps with events that never happened.

A 1996 study found that simply imagining a past event increases the participant's confidence that the event actually occurred.

This is imagination inflation. Every time you mentally simulate a memory, your brain embeds the imagery into your existing framework of past experiences. You cannot distinguish between what you remember and what you recently imagined.

The history you tell yourself is constantly being rewritten.

Where this comes from

Study
Garry, Manning, Loftus, and Sherman, 1996
What the check found
The 1996 study by Garry et al. is the foundational research for the imagination inflation phenomenon, and the claim accurately reflects its core finding regarding increased confidence.
Confidence
Well replicated

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.