A schizophrenia-like behavioral trait in the SHR model: Applying confirmatory factor analysis as a new statistical...

Area of Science:

• Neuroscience
• Psychiatry
• Animal Behavior

Background:

• Schizophrenia symptom assessment in humans relies on validated questionnaires, often employing confirmatory factor analysis (CFA).
• Animal models are crucial for studying schizophrenia, but a single behavioral paradigm doesn't capture the full phenotype.
• The Spontaneously Hypertensive Rat (SHR) strain exhibits altered behaviors relevant to schizophrenia.

Purpose of the Study:

• To investigate the existence of a unifying behavioral trait related to schizophrenia in the SHR rat model.
• To determine if five specific behavioral tasks (locomotor activity, rearing, social interaction, prepulse inhibition, contextual fear conditioning) are underpinned by a common factor.

Main Methods:

• Confirmatory Factor Analysis (CFA) was applied to behavioral data from Wistar and SHR rats (n=290 each).
• Five behavioral tasks known to be altered in SHRs and relevant to schizophrenia were analyzed.

Main Results:

• CFA confirmed the existence of a continuous, schizophrenia-like behavioral trait in both Wistar and SHR rats.
• SHR rats exhibited significantly higher values of this trait compared to Wistar rats.

Conclusions:

• This study provides the first evidence of a schizophrenia-like trait in an animal model using CFA.
• Utilizing CFA for behavioral parameter evaluation in animals may enhance pre-clinical research for psychiatric disorders.
• This approach could help reduce the translational gap between animal studies and human clinical observations in schizophrenia research.