Gross disorganization is a type of behaviour exhibited by patients suffering from psychotic disorders, when behaviour is not at par with the situation. These people lose reality contact. Behaviour might include delusion or hallucination, e.g: in disorders like schizophrenia.
Hallucination refers to the condition of perception without sensation. There are basically five types of hallucination, since hallucination can occur in all the sensory modalities, they are auditory, visual, gastatory, tactile and olfactory.
Delusion refers to false firm belief. They are largely categorized under four sub heads, they are: Delusion of grandiose, referring to fantastical belief that one is famous, omnipotent or otherwise very powerful. Delusional jealousy refers to the false believe that spouse of lover is having an affair with no proof to back up their claim. Persecutory delusion involves the thee of being followed, harassed, cheated or conspired against the pursuit of goal and delusion of Eratomania.