Iran enlisted the help of senior psychologists during negotiations with the United States to better understand and respond to President Donald Trump's behaviour, according to a report by Drop Site.
The report, citing an Iranian official, said a team of two senior psychologists was added to the advisory circle supporting Iranian negotiators during talks aimed at ending the conflict between the two countries.
According to the official, the specialists were tasked with assessing Trump's behaviour and helping negotiators craft messages that would be conveyed to the US president through regional mediators.
"We added two senior psychologists to the negotiations' advisory circle so that we can shape messages intended for President Trump from the perspective of managing what we regard as psychopathic behaviour patterns," the official was quoted as saying.
The report said the psychologists began assisting negotiators after the first round of bilateral talks in Islamabad in April, when Washington and Tehran started exchanging proposals for a possible memorandum of understanding to end the conflict.
The unnamed official claimed that Trump's responses improved after Iran began incorporating the advisers' recommendations into its communications.
The report also quoted the official as saying that Iran conducted negotiations in a manner intended to ensure that the sophistication of its negotiating methods would be evident if the communications were made public in the future.
The White House did not immediately respond to the claims.
The report comes as the United States and Iran move closer to a formal agreement following months of negotiations. According to Iranian state media, Iranian Deputy Foreign Minister Majid Takht-Ravanchi said a delegation led by Mohammad Bagher Ghalibaf would attend the expected signing ceremony in Switzerland.
The US delegation is expected to be headed by Vice President JD Vance.
Separately, the report cited a Reuters/Ipsos poll that found 61 per cent of respondents believed Trump had become more erratic with age. The survey found that 89 per cent of Democrats, 30 per cent of Republicans, and 64 per cent of independents shared that view.
Neither the US administration nor Iranian authorities have publicly commented on the reported involvement of psychologists in the negotiations.