  Searching experiments conducted in different virtual environments over a
gender balanced group of people revealed a gender irrelevant scale-free spread
of searching activity on large spatiotemporal scales. We have suggested and
solved analytically a simple statistical model of the coherent-noise type
describing the exploration-exploitation trade-off in humans ("should I stay or
should I go"). The model exhibits a variety of saltatory behaviours, ranging
from Levy flights occurring under uncertainty to Brownian walks performed by a
treasure hunter confident of the eventual success.
