Hall versus wall doorway collisions: why aren’t they right?

When walking through a doorway, research has demonstrated predominately rightward collisions, although a recent study found consistent leftward collisions. We tested whether this discrepancy resulted from differences across the testing environments (hall/wall; environmental cues) and whether it was influenced by direction of attention (up/down/straight ahead). Significant leftward biases were observed for the hall doorway; no bias was observed for the wall doorway. Environmental cues, but not direction of attention, strongly modulated hall performance only. However, neither factor explains why different studies yield different directional collision biases.