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. 2014 Jul 31;5:4524. doi: 10.1038/ncomms5524

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Copyright © 2014, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.

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The real-tool KIH experiment followed a similar procedure and timeline as the KIH experiment with 11 subjects manipulating real keys (tools). (a) The tool handle was made from plastic whereas the body was made with styrofoam. The ‘no-tool’ key consisted only of the handle. (b) The projected keyhole during a no-tool trial (left panel) and a tool trial (right panel). The subjects had to judge if the keyhole was reachable without making an actual movement to the keyhole. (c and d) We observed a significant change in only the decision boundary (T(10)=2.53, P=0.029; two-tailed t-test on the individual differences between tool trials and no-tool trials) but not in the sensitivity (T(10)=1.148, P=0.28; two-tailed t-test on the individual differences between the slopes of the tool and no-tool trials) between the tool and no-tool trials. Error bars represent s.e.