Freeman et al : virtual reality assessment of schizophrenia Flashcards
what is persecutory ideation
-The persistent false belief that there is a conspiracy against you
what is Interpersonal sensitivity
The vulnerability to perceived signs of rejection in interpersonal spaces i.e feelings of inadequacy in social settings
What is state anxiety
-Temporary state of anxiety in response to a particular situation.
What is the aim of the study
1) To investigate whether a non-clinical sample have thoughts of persecutory nature in virtual reality
2) To investigate whether there are cognitive or emotional factors that predict likelihood of persecutory ideations in subjects in the vr interactions
Describe the sample
-24 subjects , 12 males 12 females
-They were recruited from the student body and university staff at UCL
-Average age of 22 years
-They were a volunteer sample as they responded to an ad in the university asking for participants for a study.
- They were paid for their participation - incentive
What were the materials used
-A projection system with four projection walls (3 walls and a floor) (a cave)
- An inter sensed tracker for monitoring the ss head position and orientation
- an inter sensed joystick for navigating the virtual world by pressing a button to move you forward
-Lightweight crystal eye glasses that deliver a stereo view of the world
What are the outcome measures/questionnaires used
1)BSI - Brief symptom inventory
2)Paranoia scale
3) Spielberger state anxiety questionnaire
4) VR - paranoia
5)Sense of presence questionnaire
Describe the BSI - Brief symptom inventory
-A 53 item questionnaire
-Has 9 sub scales
- The sub scales are quantified over the past 7 days
The 9 sub scales are :
1) somatization
2) interpersonal sensitivity
3)OCD
4)Depression trait
5) Anxiety trait
6) Hostility
7) Phobic anxiety
8)Paranoid ideation
A total severity score called the global severity index GSI is obtained by summing up the scores in all the 53 items.
-Each item is rated on a 5 point rating scale. From 0=not at all
4= extreme
The higher the GSI score the more the global severity
Describe the general procedure
What did they do to prevent priming (hinting) of reactions
To prevent priming of reactions participants were not informed that the study was specifically examining persecutory ideas
How long were participants asked to enter the virtual world
5 minutes
What were the instructions given to the participants
“Please explore the room and try to form some impression of what you think about the people in the room and what they think about you “
How many avatars were in the library room
5
Where were the avatars
3 sat at one desk and two at another desk
What ambiguous behavior did the avatars show
Smiling, looking , talking to each other
What did the participants do after leaving the virtual world
They completed a questionnaire and a short semi-structured interview concerning their experience in the virtual world
What did the experimenters do to prevent priming of persecutory thoughts by the questionnaires
- Half the subjects completed the questionnaires post exposure
- the other half completed the questionnaires pre and post exposure
Describe the paranoia scale
-Has 20 items used to measure paranoia in college students
- contains items measuring both ideas of persecution and social reference
- Each item is rated on a 5 point scale from 1-5
- the higher the score the greater the paranoid ideation
Spielberger State Anxiety Questionnaire
-It has 20 items developed to measure state anxiety
-Each item is measured on a scale of 1-4 rated on a 4 point rating scale
-The score ranges from 20-80
-High scores indicate greater state anxiety
VR - paranoia
-Designed to measure paranoid ideation as a response to the feedback of the avatar
-Has 15 items assessing 3 areas of paranoia
- The areas are ; a) Persecutory thoughts about the avatar - items 1-5
b)ideas of reference about the avatars. items 6-10
c)Positive beliefs about the avatars . items 11-15
Sense of press questionnaire
-Measured the extent of imartion of participants in the virtual world
-This is done using 3 main criteria ;
1) sense of “being there”
2) sense of having visited a place rather than just having seeing images
3) The extent to which the virtual world dominated behaviour relative to the virtual world rather than the real world , in which participants were really located
Describe the semi-structured interview used in Freeman et al
They offered an opportunity for the ss to report any distress associated with the VR environment.
-The interviews were rated for persecutory content on a 6 point rating scale
-The interview was videotaped
List four results form Freeman et Al
-There was a positive correlation between scores on the paranoia questionnaire and the paranoia scores given based on the interview
- There was no gender differences in persecutory ideas. Although some participants had ideas of persecution.
-Higher levels of interpersonal sensitivity and higher levels of anxiety were significantly correlated with higher levels of persecutory thoughts in the VR
-VR persecution scores were positively associated with BSI paranoia scores
What are the strengths of the study
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What are the limitations of the study
Outline two findings from the study by Freeman
