def attention_check(self, participant):
return True<EOL>
Check if participant performed adequately.

        Return a boolean value indicating whether the `participant`'s data is
        acceptable. This is mean to check the participant's data to determine
        that they paid attention. This check will run once the *participant*
        completes the experiment. By default performs no checks and returns
        True. See also :func:`~dallinger.experiments.Experiment.data_check`.