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. Author manuscript; available in PMC: 2009 Mar 11.
Published in final edited form as: Cortex. 2006 Jan;42(1):90–93. doi: 10.1016/s0010-9452(08)70326-5

Fig. 1.

Fig. 1

Mean handedness index (+ s. e.) for several studies using the TUBE task in captive chimpanzees. Handedness indices are calculated following the formula [H = (#R−#L)/(#R+#L)] where R and L refer to the number of left and right hand responses (Reprinted by Hopkins et al., 2005a).