[2four2]

Most psychological experiments are far from difinitive due to the complexity and difficulty to measure abstract measurands like "perception".

[gchamonlive]

Can they produce useful results then? Do you know of any instance where even though the experiment was limited it led to breakthrough?

Not asking to trap you into the induction problem (believing that something that happened in the past will happen in the future). I'm just curious.

[munificent]

A negative result is still a useful result.

Before this experiment, no one knew if a high-stress environment would speed up visual perception. Now we have some evidence that it does not.

[gchamonlive]

Only if paired with a follow-up hypothesis, otherwise you only mapped the outer boundaries of your domain, but gained no information about the domain of study itself.