Get fMRI data object that is associated with the given experiment.

        Parameters
        ----------
        experiment_id : string
            unique experiment identifier

        Returns
        -------
        FMRIDataHandle
            Handle for fMRI data object of None if (a) the experiment is unknown
            or (b) has no fMRI data object associated with it.

def experiments_fmri_get(self, experiment_id):
        """Get fMRI data object that is associated with the given experiment.

        Parameters
        ----------
        experiment_id : string
            unique experiment identifier

        Returns
        -------
        FMRIDataHandle
            Handle for fMRI data object of None if (a) the experiment is unknown
            or (b) has no fMRI data object associated with it.
        """
        # Get experiment to ensure that it exists
        experiment = self.experiments_get(experiment_id)
        if experiment is None:
            return None
        # Check if experiment has fMRI data
        if experiment.fmri_data_id is None:
            return None
        # Get functional data object handle from database.
        func_data = self.funcdata.get_object(experiment.fmri_data_id)
        # Create fMRI handle from functional data handle
        return funcdata.FMRIDataHandle(func_data, experiment_id)