As a great way to ring in the new year, a paper of mine was published in the January 2016 issue of Psychophysiology. This paper is part of a Special Issue on the topic of Diversity and Representation, a topic which is critically important (both in psychophysiological research and in academia more generally).
The premise of the paper, and the thrust of the special issue, is simple: demographic variables matter. It's important to conduct psychological research on as broad and diverse a sample of participants as possible, and to look at demographic variables (such as sex, race, and socioeconomic status) during data analysis.
In our paper, healthy adults and patients with brain damage listened to musical clips while electrodermal activity was recorded. When analyzing the data without regards to sex, there were no differences in skin conductance responses between healthy adults and brain-damaged participants. However, there was a significant interaction between brain injury status and sex, in that brain damage significantly reduced skin conductance in men, but not women.
If you're interested in reading more about inclusion and diversity in psychophysiological research, check out the special issue here.