Henrich Comment

11.3 Brief comms AM NEW 5/3/04 9:45 am Page 3brief communicationsCOMMUNICATIONS ARISINGthe abundance of mural-precursor cells responders will never reject any non-zeroallowed efficient recruitment and invest- Animal behaviour offer). Once some responders are willing toment of mural cells to the engineered ves- reject low offers, self-interest guaranteesInequity aversion insels, thereby enhancing their stability. that proposers will raise their offers.The vascular permeability of the engi- Tw o kinds of variation from the standardcapuchins?neered vessels is higher than that of normal, ultimatum game suggest that humans,1quiescent vessels, but is in the lower range rosnan and de Waal have shown that unlike capuchins, would not reject in Bros-of permeability values induced by various nan and de Waal’s experimental context.capuchin monkeys are more likely toangiogenic molecules (see supplementary Breject a cucumber slice after seeing Two versions of a reduced-form ultimatum6information). As in normal microcircula- game have been comparedthat another capuchin has received a more : the first was ation, arteriolar and venular sides of the attractive grape. In interpreting this find- standard game, except that proposers hadengineered vessels are readily identified by ing, the authors make a link to work in only two choices, an equitable allocation orthe pattern of blood flow. Local administra- humans on ‘inequity aversion’ and suggest a highly inequitable ...