Table 2.

Classification of VR intervention types.

Type of VR Intervention	Description
VR training	Training consisting of a series of 3D-VR scenarios reproducing daily life and related challenges, to training and improve cognitive skills of schizophrenic subjects.
VR SST	Virtual reality social skill training (VR SST), consist of a VR version of classic SST intervention, thought conversation training and role-plays focused on interpersonal communication. It aimed at enhancing verbal, non-verbal skills and social cognition, detecting and correcting the errors committed by the patient on multiple communication levels.
VR Avatar therapy	The therapy involves a three-way conversation between therapist, patient and a VR digital simulation (avatar) of one of his hallucinated voices, made by patients himself as a representation of the entity to which he attributes his auditory hallucinations. The therapist’s voice is transformed through speech transformation software to coincide with the vocal characteristics attributed by the patient to the entity.
VR CBT (cognitive behavior therapy)	Use of techniques of cognitive behavioral psychotherapy (CBT) for the treatment of delusional disorders and paranoia, taking advantage of the immersive environment offered by VR, that allows a controlled exposure to social situation.
VR exposure	Therapy based on controlled exposure in a virtual reality environment to a situation or a stimulus that usually causes anxiety and fear in the subject, in order to induce a progressive desensitization towards it.