A new study reveals how we can use our haptic senses to count hidden objects.
Participants could distinguish between 1, 2, 3, 4, and 5 small spheres after 5 seconds of shaking a box.
The authors considered that restricting the set of possible answers could bias participants or give them additional information that they would not normally have. So in their second experiment, a new group of participants completed the task without knowing the range of possible answers. In this case, performance was nearly identical to that in first experiment, showing the same level of accuracy and the same underestimating bias.
The current study shows that auditory information is not actually required. Even with noise-canceling headphones, participants were quite accurate, indicating that haptic cues alone are sufficient to estimate the number of spheres in the box.
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