[basseq]

Or is it the ability to deal with stress, regardless of the source? If I'm reading the study[1] correctly, offspring of stressed fathers were less stressed than offspring of non-stressed fathers:

> Alternatively, a reduced physiological stress response may reflect an adaptive response programmed by the paternal lineage as a protective measure, ensuring greater offspring fitness in what is expected to be a more stressful environment.

Interestingly, this doesn't seem to be associated with "serotonin in mediating changes in [...] stress", most commonly associated with SSRIs, which are used to treat psychological disorders such as depression, anxiety, etc.

[1] http://www.jneurosci.org/content/33/21/9003.long