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[Latent inhibition threshold in Roman high-avoidance rats: a psychogenetic model of abnormalities in attentional
A Fernández-Teruel1, G Blázquez, M Pérez
1Unidad de Psicología Médica, Departamento de Psiquiatría y Medicina Legal, Instituto de Neurociencias, Facultad de Medicina, Universidad Autónoma de Barcelona, Bellaterra (Barcelona). albert.fernandez.teruel@uab.es
Introduction:
Basic research devoted to the study of the psychobiological anomalies of schizophrenia, as well as of its treatments, has used animal models in which some psychotic-like symptoms are induced by administration of psychostimulant drugs. There is, however, a growing necessity of having animal models presenting better construct validity, i.e., animal lines spontaneously showing phenotypes associated to the psychotic spectrum (for instance, enhanced sensitivity to psychostimulants, or cognitive and attentional anomalies characteristic of schizophrenic disorders). Several lines of evidence suggest that the RHA (Roman high-avoidance) rat strain presents a neurobehavioral profile which is consistent with such goals.
Methods:
RHA rats were compared to Sprague-Dawley (SD) rats (as a standard control strain) for the expression of latent inhibition (in a 100-trial session of two-way active avoidance) under threshold conditions (i.e., only 15 preexposures to the conditioned stimulus were administered).
Results:
Under such experimental conditions SD rats showed significant latent inhibition of the two-way active avoidance response (both during the first 50 trials and in the whole 100-trial session), while that attentional phenomenon did not appear in the RHA strain.
Conclusions:
The experimental results obtained here indicate that RHA rats display a deficit of latent inhibition at threshold conditions, an information processing (or attentional) anomaly which typically appears in schizophrenic patients. It is proposed that RHA rats might be an useful animal model for the study of vulnerability to some schizophrenic symptoms. This conclusion is supported by data that indicate that latent inhibition deficits are a characteristic attentional abnormality of these diseases.
Insights
Roman high-avoidance (RHA) rats exhibit a latent inhibition deficit, suggesting they are a valuable animal model for studying schizophrenia symptoms. This attentional anomaly is characteristic of the disorder.
Area of Science:
- Neuroscience
- Animal Models
- Psychiatry
Background:
- Schizophrenia research often uses animal models with induced psychotic symptoms.
- There is a need for animal models with higher construct validity, exhibiting spontaneous phenotypes related to the psychotic spectrum.
- Roman high-avoidance (RHA) rats show promise as such a model due to their neurobehavioral profile.
Purpose of the Study:
- To investigate the latent inhibition (LI) response in RHA rats compared to Sprague-Dawley (SD) rats.
- To assess the construct validity of RHA rats as a model for schizophrenia-related attentional deficits.
Main Methods:
- Comparison of RHA rats and Sprague-Dawley (SD) rats.
- Assessment of latent inhibition in a 100-trial two-way active avoidance task.
- Utilizing threshold conditions with 15 preexposures to the conditioned stimulus.
Main Results:
- SD rats demonstrated significant latent inhibition of the avoidance response.
- RHA rats did not exhibit latent inhibition under the tested threshold conditions.
- This indicates an attentional processing anomaly in RHA rats.
Conclusions:
- RHA rats show a deficit in latent inhibition under threshold conditions, mirroring an anomaly seen in schizophrenic patients.
- RHA rats may serve as a useful animal model for investigating vulnerability to schizophrenia symptoms.
- Latent inhibition deficits are a key attentional abnormality associated with schizophrenia.
