Create a Json-like object for an experiment. Extends the basic
        object with subject, image group, and (optional) functional data
        identifiers.

        Parameters
        ----------
        experiment : ExperimentHandle

        Returns
        -------
        Json Object
            Json-like object, i.e., dictionary.

def to_dict(self, experiment):
        """Create a Json-like object for an experiment. Extends the basic
        object with subject, image group, and (optional) functional data
        identifiers.

        Parameters
        ----------
        experiment : ExperimentHandle

        Returns
        -------
        Json Object
            Json-like object, i.e., dictionary.
        """
        # Get the basic Json object from the super class
        json_obj = super(DefaultExperimentManager, self).to_dict(experiment)
        # Add associated object references
        json_obj['subject'] = experiment.subject_id
        json_obj['images'] = experiment.image_group_id
        if not experiment.fmri_data_id is None:
            json_obj['fmri'] = experiment.fmri_data_id
        return json_obj