Oops… two PhD prof.'s and their grad student couldn’t even be bothered to reread their tiny 12-page report and keep their conclusions straight when summarizing the second and third experiment.
“As in Experiment 1, subjects reported that A+B+C felt heavier than A (90%, p<.001; Figure 3), even when they didn’t “lift” the boxes at all but simply felt their pressure against their passively open palms. This suggests that neither differences in grasp posture nor in lifting force explain the impossible experience of one object feeling heavier than a group that includes it.” (p.10/ex.3, and almost exact same wording on p.8/ex.2.)
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