Reductionism about personal identity, as developed by Parfit in Reasons and Persons, dissolves the deep self/other distinction by showing that what matters in survival is psychological continuity, which admits of degrees across persons as well as times.

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Admits of degrees(Explaining that responsibility isn't simply present or absent): Can exist in different amounts or levels rather than being all-or-nothing; something that comes in stronger and weaker versions.
Derek Parfit(as a philosopher being cited for his theory on personal identity): A highly influential philosopher who argued that personal identity (what makes you 'you' over time) is less important than we think, and that we're not the unified, continuous selves we assume we are.
Reasons and Persons(as the source text): A landmark 1984 philosophy book by Derek Parfit that explores how we should live and make decisions, especially when our personal interests conflict with what's best for everyone.
The self/other distinction(what the reductionist view challenges): The common-sense feeling that there's a clear dividing line between 'me' and 'everyone else'—that I'm fundamentally separate from other people in some deep way.

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