Differential Susceptibility
The idea that some people are more sensitive to environmental influences—both positive and negative—due to biological traits, rather than uniformly resilient or vulnerable.
A developmental theory proposing that certain individuals possess heightened biological sensitivity to environmental conditions. Rather than being inherently more vulnerable, these people respond more strongly to both supportive and adverse contexts. Originally studied in child development, it explains why identical environments produce different outcomes across people.
What this means in real life
Two children grow up in chaotic homes. One develops anxiety and behavioral problems; the other seems unaffected. Differential susceptibility suggests the first child isn't weaker—they're simply more attuned to environmental stress, and would thrive exceptionally well in a calm, nurturing setting.
What it isn’t
It is not the claim that some people are simply more fragile or damaged. Rather, it proposes that sensitivity itself is a trait that can be adaptive in the right environment, not a fixed deficit requiring correction.
Commonly misused online
Often flattened into 'some people are just more sensitive' without the crucial second half: that this sensitivity can be an advantage in supportive contexts, not merely a burden to manage.