The Globe and Mail reports in its Friday edition that after years of surging stock prices, tech leaders are sounding more grounded about artificial intelligence. The Globe's guest columnist Sam Sivarajan writes that Infosys chair Nandan Nilekani joined Microsoft's Satya Nadella and IBM's Arvind Krishna in suggesting that we have entered the "trough of disillusionment" -- the sobering dip that often follows the initial excitement over new technology. Nvidia, Palantir Technologies and C3.ai have captivated investors, at least until recently. The real question, however, is not what AI can do -- it is whether we are ready to trust it. Mr. Nilekani said: "For the first time, we intend to place trust in non-human intelligence for decision-making. And that leap of faith is not an easy one." That line hits the core of the issue. The limits holding AI back are not primarily technical -- they are human. Behavioural economists call this reluctance the ambiguity effect: People tend to pull back when information is uncertain or incomplete. Investors chased Internet stocks in the late 1990s, leading to a value disconnect. A similar trend may be happening with AI, as Goldman Sachs reports tech firms will spend over $1-trillion on it.