Does the brain work better:
...sitting rather than lying down.
...standing rather than sitting.
...walking rather than standing.
I have found this research, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3973903/, The effect of body posture on cognitive performance: a question of sleep quality, but it does not speak to decision making. The same for http://razlab.mcgill.ca/docs/Body_posture_alters_human_resting_state.pdf.
Can you offer examples of studies of cognitive function vs. body position.