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. 2008 Jan 8;275(1636):835–840. doi: 10.1098/rspb.2007.1542

Table 2.

Matching to direction witnessed in first responses by chimpanzees and children (probability levels are for results this extreme or more so).

species condition first response match demo first response match demo enhanced ghost and ghost total match demo responses compared with chance
chimpanzees push demo 7/8 (p=0.04) 8/8 (p=0.01)
enhanced ghost 6/7 (p=0.06) 12/15 (p=0.02) 7/7 (p=0.01)
ghost 6/8 (p=0.15) 4/7 (p=0.27)
children push demo 7/7 (p=0.01) 7/7 (p=0.01)
enhanced ghost 7/8 (p=0.04) 13/16 (p=0.01) 8/8 (p=0.01)
ghost 6/8 (p=0.15) 6/8 (p=0.11)