He has collaborated on research on how political negotiations could be made more likely to produce agreement. Atran and the psychologists Jeremy Ginges and Douglas Medin and political scientist Khalil Shikaki conducted an experiment that surveyed "600 Jewish settlers in the West Bank, more than 500 Palestinian refugees, and more than 700 Palestinian students, half of whom identified with Hamas and Palestinian Islamic Jihad." The researchers divided the subjects into three groups, each of which was presented with a different "hypothetical peace deal." In the basic situation, those surveyed were presented with "a two-state solution in which the Israelis would withdraw from 99 percent of the West Bank and Gaza but would not have to absorb Palestinian refugees"; the proposal "did not go over well." For the second group, the hypothetical deal "was sweetened with cash compensation from the United States and the European Union, such as a billion dollars a year for a hundred years, or a guarantee that the people would live in peace and prosperity. With these sweeteners on the table, the nonabsolutists, as expected, softened their opposition a bit. But the absolutists, forced to contemplate a taboo tradeoff, were even more disgusted, angry, and prepared to resort to violence." But for the third group, the proposed two-state solution was "augmented with a purely symbolic declaration by the enemy in which it compromised on one of its sacred values."