(bio GID) NvN - nature stance, origins of GID due to biological factors - genetics, hormonal differences and differences in brain structure, specifically BSTc. Supported by Hare et al. Demonstrating how biological explanation adopt nature side of continuum. However research indicates social factors also implicate. Staller proposed GID occurs due to distorted parental attitudes, extreme stress during adult life disturbs al aspects of identity. TS - interactionist approach more appropriate, such as DSM, highlighting not one side of the debate can be used to explain disorder