Halevy, now at Hebrew University, complains that Israel has not been directly involved in the negotiations.

NPR: Diplomacy With Iran Spurs Concern In Israel

Former Mossad head Efraim Halevy has repeatedly called for talks with the Islamist group.

NPR: Israelis, Government Divided on Dealing with Hamas

If this continues, Mr Halevy foresees "permanent conflict" which neither side could sustain.

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Quest leaves, convinced Halevy may have been trying to recruit him.

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"The incentives are far reaching, " Halevy says.

NPR: Diplomacy With Iran Spurs Concern In Israel

Psychologists Nir Halevy, Yair Berson, and Adam Galinsky set out to find the answer in a series of new studies, pitting one style of leadership against the other to see which style is generally preferred, and why.

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Ephraim Halevy, the former head of Israel's foreign intelligence agency, the Mossad, is one of many in Israel who stand opposed to the idea of offering new incentives to Iran in return for a freeze of its uranium-enrichment program.

NPR: Diplomacy With Iran Spurs Concern In Israel

Unknown to the participants, Dr Halevy and Dr Galinsky had conducted an independent test, using 58 people not involved in the main study, to rate how demeaning, humiliating, degrading, embarrassing and uncomfortable each of the ten possible activities actually was.

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Some prominent officials, however, including former U.S. Secretary of State Colin Powell, the former head of Israel's Mossad, Ephraim Halevy, are saying publicly, look, you have to talk to your enemies, you have to engage Hamas, however distasteful it might be.

NPR: Arab Delegation Takes Peace Proposal to Israel