Social Request and Social Affordance Figure 2. Mean values of kinematic parameters of grasping, reaching and placing analyzed in experiments 1–6. Bars are SE. Asterisk indicates significance in the ANOVAs. doi:10.1371/journal.pone.0015855.g002 PLoS ONE | www.plosone.org 5 January 2011 | Volume 6 | Issue 1 | e15855