The sales clerks at nordstroms found anna's behavior very odd. she wandered through the designer dress section, muttering to herself. she was dressed in a dirty vintage prom dress and a tiara, but she hadn't bathed or combed her hair recently. on her bare arms she had carefully pasted slips of paper that she had cut from a magazine; the words and pictures on these slips of paper seemed to hold meaning for her. a clinical psychologist might consider anna's behavior--disorganized thinking, hearing voices--as positive symptom of _______________.