Does Acute Oxytocin Administration Enhance Social Cognition in Individuals With Schizophrenia?
Individuals with schizophrenia have been found to have deficits in social cognition, which is defined as the functions that are engaged during social interactions. Social cognition has been found to be critical in predicting multiple aspects of community functioning. There are no currently available medications that have been consistently found to improve social cognition in individuals with schizophrenia. Oxytocin functions as a neurotransmitter that is thought to be involved in multiple aspects of social behavior and related emotions. In this study, we test the hypothesis that acute administration of intranasal oxytocin will improve social cognition in individuals with schizophrenia.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Does Acute Oxytocin Administration Enhance Social Cognition in Individuals With Schizophrenia?|
- Social Cognition composite measure [ Time Frame: Visit 2 (baseline), Visit 3 (1 week following, post-treatment) ] [ Designated as safety issue: No ]Our primary outcome measure will be a composite score created by combining the four main social cognition measures assessed in this study (two "high-level" measures and two "low-level" measures). Because these measures are not on the same scale, we will first z-score (center and scale) each of the four measures at each time point using the baseline mean and standard deviation of the whole sample and then add the z-scores to create the composite social cognition score.
- Theory of Mind Assessment (high level social cognition) [ Time Frame: Visit 2 (baseline), Visit 3 (1 week following, post-treatment) ] [ Designated as safety issue: No ]The Awareness of Social Inference Test (TASIT Part III: Social Inference - Enriched) will be administered to assess theory of mind.
- Empathic Accuracy (high level social cognition) [ Time Frame: Visit 2 (baseline), Visit 3 (1 week following, post-treatment) ] [ Designated as safety issue: No ]In this task, participants will watch 12 video clips. Each clip shows the head and shoulders of one of 6 individuals while he/she discusses a positive or negative autobiographical event. For each clip, participants will use a 9-point scale to rate how positive or negative they believe the individual is feeling. The primary dependent measures will be the correlations between participant ratings of the targets' emotions and the targets' ratings of their own emotions. The mean correlation across clips provides an "empathic accuracy" score for each participant.
- Social Perception Assessment (low level social cognition) [ Time Frame: Visit 2 (baseline), Visit 3 (1 week following, post-treatment) ] [ Designated as safety issue: No ]We will assess social perception using the Half-Profile of Nonverbal Sensitivity (Half-PONS). Brief scenes are shown that include facial expressions, voice intonations, and/or body gestures. Subjects select a label that best describes the situation. The dependent measure is the total number of correct labels.
- Facial Affect Recognition (low level social cognition) [ Time Frame: Visit 2 (baseline), Visit 3 (1 week following, post-treatment) ] [ Designated as safety issue: No ]Participants are asked to identify facial expressions of emotion in still photographs from the standardized stimulus set developed by Ekman. The test includes digitized color photos of eight different posers displaying facial expressions of six basic emotions plus neutral expressions. On each trial, a photo and a list of the seven possible expressions are simultaneously presented on the screen. The participant verbally identifies the emotion he/she believes is correct and the experimenter enters the response. The dependent measure is the total number correct.
- Positive and Negative Syndrome Scale (PANSS) for Schizophrenia [ Time Frame: Visit 2 (baseline), Visit 3 (1 week following, post-treatment) ] [ Designated as safety issue: No ]This is a frequently used instrument, initially developed by Kay, Opler, and Fiszbein, that assesses 30 different symptoms (categorized into positive, negative, and general psychopathology) on a scale from 1 to 7, based on clinical interview. It will be used to compare the psychopathology between the two treatment groups.
|Study Start Date:||April 2011|
|Study Completion Date:||August 2012|
|Primary Completion Date:||August 2012 (Final data collection date for primary outcome measure)|
Placebo Comparator: Inactive nasal spray
A placebo nasal spray will be prepared to be otherwise identical to the active treatment nasal spray except lacking oxytocin. The ingredients in the inactive nasal spray are mannitol, glycerin, and preserved water.
Drug: Inactive placebo nasal spray
A placebo nasal spray will be prepared identically to the oxytocin nasal spray except lacking oxytocin. Its ingredients are mannitol, glycerin, and preserved water. It will be administered at 5 sprays to each nostril, one time.
Experimental: Intranasal Oxytocin
Oxytocin nasal spray (40 units/ml) will be administered in a single intranasal dose of 40 IU. Its formula is: oxytocin 1 unit/mg mannitol trituration 0.2Gm + glycerin USP 0.1ml + preserved water 5ml.
Oxytocin 40 units/ml nasal spray: use 5 sprays per nostril (40 IU total) one time
Schizophrenia is characterized by the presence of positive symptoms (delusions, hallucinations, disorganization of thought process and behavior) as well as negative symptoms (blunted affect, alogia, and avolition), neurocognitive deficits, and impaired social cognition. While positive symptoms can often respond well to antipsychotic medications, the latter symptoms are more difficult to treat. In this study, we will focus on social cognition, which is defined as the functions that are engaged during social interactions. Social cognition has been categorized into four main domains: theory of mind, social perception, attributional bias, and emotional processing. Social cognition in patients with schizophrenia has been found to be critical in predicting multiple aspects of community functioning. There are currently two broad approaches to improve social cognition in patients with schizophrenia: pharmacological and psychosocial interventions. While psychosocial interventions (training exercises to target improvement in domains of social cognition) have shown some benefit, their resultant improvements have been limited in their distribution across multiple domains as well as their generalization to improved functioning in the community. Pharmacological trials have yielded mixed results, and there are not any currently available medications that have been consistently found to improve social cognition in patients with schizophrenia2. One potential future therapeutic target for enhancing social cognition is the oxytocin system.
Oxytocin is a nine-amino acid peptide that, in addition to its role in the periphery for regulating lactation and uterine contractions, functions centrally as a neurotransmitter which is involved in multiple aspects of social behavior and related emotions. Specifically, it has been found to modulate emotion recognition, trust, eye contact, empathic accuracy, as well as envy and gloating. Given oxytocin's role in social functioning, in conjunction with the deficits in social functioning found frequently in individuals with schizophrenia, there have been several studies over the past three decades examining the oxytocin system in humans with schizophrenia and in rodent experimental models.
It has been found that individuals with schizophrenia do not show the same level of increase in oxytocin as normal controls in response to trust-related interpersonal interactions, and low plasma oxytocin predicted negative symptoms of schizophrenia. Additionally, it has also been found that plasma oxytocin levels predicted the ability of patients with schizophrenia to identify facial expressions. Finally, it has been found recently that sustained regular administration of intranasal oxytocin significantly reduced both positive and negative symptoms of schizophrenia. Thus, there is significant evidence supporting further research studying the effect of oxytocin on social cognition. It is not yet known if exogenous administration of oxytocin will have acute effects on neuropsychological measures of social cognition in individuals with schizophrenia, and this is the focus of this proposed pilot study.
The overall hypothesis guiding this study is that acute oxytocin administration will improve social cognition (as assessed by a composite score comprising two measures of "low level" social cognitive processes and two measures of "high level" social cognitive processes) in individuals with schizophrenia. Our primary goals are to assess the feasibility of this experimental paradigm and to generate pilot data and obtain estimates of effect sizes which can be used in planning future larger studies.
|United States, California|
|West Los Angeles VA Healthcare Center|
|Los Angeles, California, United States, 90073|
|Principal Investigator:||Stephen R Marder, M.D.||VA Greater Los Angeles|