Oddly Wired
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egocentric

You naturally remember yourself doing more work than others.

The egocentric bias leads individuals to claim more responsibility for a collective outcome than they objectively contributed.

In studies of teams, members are asked to estimate the percentage of their own contribution to a project; when the individual percentages are totaled, they consistently exceed 100%.

You are the protagonist of your own memory, inflating your share of the effort.

Where this comes from

Study
Ross and Sicoly, 1979
What the check found
Ross and Sicoly (1979) established this finding. The bias in reporting contributes to the 'total exceeds 100%' result in collaborative or joint-effort settings.
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.