(IvN) TA - aggression - biological explanations to aggression are nomothetic, as seek to generalise findings to wider groups (usually males). Supported by Moffitt et al, studied 442 NZ males birth - 26, testing for MAOA-L variant and histoires of abuse. Found those with MAOA-L and abuse 9x more likely to exhibit ASB including aggression. TS how nomothetic approach can be applied to explain aggression in humans.