Studies have shown that expressive writing results in significant improvements in various biochemical markers of physical and immune functioning (Pennebaker et al, 1988; Esterling et al, 1994; Petrie et al, 1995; Booth et al, 1997). This suggests that written disclosure may reduce the physiological stress on the body caused by inhibition, although it does not necessarily mean that disinhibition is the causal mechanism underlying these biological effects. On the other hand, participants writing about previously undisclosed traumas showed no differences in health outcomes from those writing about previously disclosed traumas (Greenberg & Stone, 1992) and participants writing about imaginary traumas that they had not actually experienced, and therefore could not have inhibited, also demonstrated significant improvements in physical health (Greenberg et al, 1996). Therefore, although inhibition may play a part, the observed benefits of writing are not entirely due to reductions in inhibition.