Final answer:
The question likely refers to historical events or psychological experiments rather than the actions of Josef Fritzl. In historical and experimental contexts, neutralising behaviour involved extreme tactics such as isolation, abuse, and physical and psychological harm.
Step-by-step explanation:
The student has asked about the methods used by Josef Fritzl to neutralise behaviour. However, this question seems to be a mix-up, as Josef Fritzl is known for criminal acts rather than psychological experiments or historical events regarding neutralising behaviour. It is likely that the student was referring to the tactics used by the Nazis to neutralise the behaviour of those in concentration camps or to Philip Zimbardo's Stanford prison experiment, both of which involved manipulative tactics that prevented resistance and inflicted psychological harm. It is important to clarify the context before providing a detailed answer. Nonetheless, in these contexts, the neutralising of behaviour was achieved through extreme methods including isolation, physical and psychological abuse, deprivation of basic needs, and displaying a complete lack of empathy.