Are two heads better than one?

Are two heads better than one? - A review on group benefits in joint perceptual tasks, the influencing factors, and how to measure it.

Humans often collaborate in perceptual tasks to achieve a higher performance
than performing the same task alone (i.e., attain a group benefit). In this
review, Wahn et al. identify factors that influence collaborative strategies
and the extent of group benefits in two frequently investigated joint
perceptual tasks: visuospatial tasks and decision-making tasks. They also
provide a framework of measures to assess group benefits in perceptual
tasks.