Middle East Crisis: Both sides complain of bias now as in 1982

You could be forgiven for thinking the television images in the experiment were from 2006. They were really from 1982: Israeli forces were clashing with Arab militants in Lebanon. The world was watching, charges were flying, and the air was thick with grievance, hurt and outrage.

There was only one thing on which pro-Israeli and pro-Arab audiences agreed. Both were certain that media coverage in the United States was hopelessly biased in favor of the other side.

The endlessly recursive conflict in the Middle East provides any number of instructive morals about human nature, but it also offers a psychological window into the world of partisan behavior. Israel's 1982 war in Lebanon sparked some of the earliest experiments into why people reach dramatically different conclusions about the same events.

The results say a lot about partisan behavior in general -- why Republicans and Democrats love to hate each other, for example, or why Coke and Pepsi fans clash. Sadly, the results also say a lot about the newest conflicts between Israel and its enemies in Lebanon and the Palestinian territories, and why news organizations are being besieged with angry complaints from both sides.

Partisans, it turns out, don't just arrive at different conclusions; they see entirely different worlds . In one especially telling experiment, researchers showed 144 observers six television news segments about Israel's 1982 war with Lebanon.

Pro-Arab viewers heard 42 references that painted Israel in a positive light and 26 references that painted Israel unfavorably.

Pro-Israeli viewers, who watched the very same clips, spotted 16 references that painted Israel positively and 57 references that painted Israel negatively.

Both groups were certain they were right and that the other side didn't know what it was talking about.