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. 2006 Apr 25;103(18):7181–7185. doi: 10.1073/pnas.0601247103

Fig. 4.

Fig. 4.

Mean (+SD) looking time (in seconds) for each of the four conditions involving white and blue towels and either a blue knife or a glass with blue paint as transforming agents. Two-tailed P value levels are indicated for each contrast based on t tests. Imposs-1, the impossible-1 test; Imposs-2, the impossible-2 test.