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Neuropsychological characterization in clinical subtypes of an Obsessive-Compulsive Disorder (OCD) sample of patients

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Author(s): Garcell , Josefina Ricardo | Lóyzaga Mendoza, Cristina | Reyes Zamorano, Ernesto | Tirado Durán, Elsa

Journal: Salud Mental
ISSN 0185-3325

Volume: 30;
Issue: 1;
Start page: 1;
Date: 2007;
Original page

Keywords: Obsessive-compulsive disorder | Wisconsin Card Sorting Test | Trail Making Test | OCD clinical subtypes | Yale-Brown Severity Scale.

ABSTRACT
Since the decade of the seventies, several neuropsychological abnormalities in very different cognitive domains have been described among patients with Obsessive-compulsive disorder (OCD). Due to the nature of these abnormalities, it was concluded that possibly the main dysfunction for this disorder was located in the right hemisphere, especially in the frontal cortex; nevertheless this particular brain region was found to be involved in other psychiatric disorders, so neuropsychological results were considered to be of limited precision and it was thought that the diversity in results was not due to the malfunction of one particular brain region. So it became evident that a new research methodology based in the information processing model with highly specific neuropsychological paradigms of frontal functioning was needed; as well as considering a subtypology based in the cognitive characteristics in patients with the same disorder and similar phenomenology. Regarding OCD it is well known that the dorsolateral prefrontal cortex is in charge of the regulation of complex actions, executive functions and the elaboration of logical strategies in a problem solving task; so its dysfunction causes a failure in the creation of response patterns and perseverations due to the inability to change a pattern when an alternative response is needed. On the other hand, obsessions are associated mainly with the anterior cingulated cortex and the basal region of the corpus striatum and its connections with the limbic system, giving place to incapacity to select the relevant information from the environment, which makes the individual perceive irrelevant stimuli as threatening for physical integrity.

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