Which is a better poster orientation: Vertical/portrait (taller than wide) or horizontal/landscape (wider than tall)? Assume that the content does not "naturally" fit either of these formats so as to make one choice obvious.
Are there any studies that explore the differences between these two?
If you aren't aware of any, what psychological mechanisms might underly differences in the way people perceive the research (or researcher) based on the difference between the orientations?
I'm not interested in answers that say "it's just a subjective personal style choice" but am interested in answers that detail at least some difference in what may be perceived or communicated differently as a result of a change in orientation.
If there are strong field-specific conventions, those would be good to know (because being the only person who fails to follow that structure might give an impression that this person is an outsider or doesn't understand the community) but it'd be nice to have at least some answers that can apply in a very broad multidisciplinary poster session which is too topically diverse for any field-specific orientation convention to apply.
For the purposes of answering here, please assume the two dimensions are fixed at a bit under 3 and 4 feet, but orientation is not fixed.