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Space and time bisection in schizophrenia

[PDF] Martinez_Schizophrenia.pdf (755.8Kb)
Identificadores
URI: http://hdl.handle.net/10481/31000
ISSN: 1664-1078
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Autor
Martínez-Casales, Isidro; Fuente, Juanma de la; Santiago de Torres, Julio
Editorial
Frontiers in Foundation
Materia
Common coding
 
Schizophrenia
 
Time
 
Space
 
Bisection tasks
 
Fecha
2013
Referencia bibliográfica
Martínez-Casales, I.; Fuente, J.; Santiago, J. Space and time bisection in schizophrenia. Frontiers in Psychology, 4: 823 (2013). [http://hdl.handle.net/10481/31000]
Patrocinador
This research has been funded by grants P09-SEJ-4772 (Consejería de Innovación, Ciencia y Empresa, Andalusian Government), PSI2012-32464 (Spanish Ministery of Economy and Competitivity), to Julio Santiago (PI), and by a FPU scholarship from the Spanish Ministery of Education to Isidro Martínez-Cascales.
Resumen
As a test of the idea of a common brain system responsible for representing all prothetic dimensions, schizophrenic patients and healthy participants took part in a line bisection task and two visual temporal bisection tasks, one using durations from 1 to 4 s and another using 30 s long specially designed stimuli (aging faces). Against expectations, schizophrenics showed better precision (smaller variable error) both in line bisection and the aging faces temporal task than healthy controls. Moreover, patients also showed less bias (smaller constant error) than controls in the aging faces task. This increased precision correlated with degree of severity of schizophrenia. Although no group differences were found in the temporal task with shorter intervals, both variable and constant error measures correlated marginally with severity of schizophrenia, also in the direction of smaller error in more severe cases. Thus, overall, spatial and temporal tasks behaved similarly across groups. However, bias and precision indexes did not covary across the three tasks when correlations where computed over the whole set of participants in the present study. The results thus provide mixed support for a common system behind spatial and temporal processing and point toward the need of developing a more nuanced view of magnitude representation in the mind/brain.
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