Several contributions have reported an altered expression of pseudoneglect in psychiatric disorders, highlighting the existence of an anomalous brain lateralization in affected subjects. Surprisingly, no studies have yet investigated pseudoneglect in first-degree relatives (FdR) of psychiatric patients. We investigated performance on "paper and pencil" line bisection (LB) tasks in 68 schizophrenic patients (SCZ), 42 unaffected FdR, 41 unipolar depressive patients (UP), and 103 healthy subjects (HS). A subgroup of 20 SCZ and 16 HS underwent computerized LB and mental number line bisection (MNL) tasks requiring judgment of prebisected lines and numerical intervals. Moreover, we evaluated, in a subgroup of 15 SCZ, performance on LB and MNL before and after parietal transcranial direct current stimulation (tDCS). In comparison to HS and UP, SCZ showed a systematic rightward bias on LB, partially corrected by selective right posterior parietal tDCS. Interestingly, even FdR showed a lack of pseudoneglect on LB, expressing a mean error lying in the middle between those of HS and SCZ. On the other hand, our results showed no significant difference between the performance of SCZ and HS on MNL. Both groups showed a comparable leftward bias that could not be significantly altered after left or right parietal tDCS. These findings confirm the existence of reduced lateralization in SCZ, suggesting specific impaired functioning of the right parietal lobule. Notably, we report a lack of pseudoneglect not only in SCZ but also in FdR, raising the hypothesis that an inverted laterality pattern may be considered a concrete marker of schizotypal traits.

Ribolsi, M., Lisi, G., DI LORENZO, G., Koch, G., Oliveri, M., Magni, V., et al. (2013). Perceptual pseudoneglect in schizophrenia: candidate endophenotype and the role of the right parietal cortex. SCHIZOPHRENIA BULLETIN, 39(3), 601-607 [10.1093/schbul/sbs036].

Perceptual pseudoneglect in schizophrenia: candidate endophenotype and the role of the right parietal cortex

Ribolsi, M;DI LORENZO, GIORGIO;PEZZAROSSA, BIANCA;SAYA, ANNA;RUBINO, IVO;NIOLU, CINZIA;SIRACUSANO, ALBERTO
2013-05

Abstract

Several contributions have reported an altered expression of pseudoneglect in psychiatric disorders, highlighting the existence of an anomalous brain lateralization in affected subjects. Surprisingly, no studies have yet investigated pseudoneglect in first-degree relatives (FdR) of psychiatric patients. We investigated performance on "paper and pencil" line bisection (LB) tasks in 68 schizophrenic patients (SCZ), 42 unaffected FdR, 41 unipolar depressive patients (UP), and 103 healthy subjects (HS). A subgroup of 20 SCZ and 16 HS underwent computerized LB and mental number line bisection (MNL) tasks requiring judgment of prebisected lines and numerical intervals. Moreover, we evaluated, in a subgroup of 15 SCZ, performance on LB and MNL before and after parietal transcranial direct current stimulation (tDCS). In comparison to HS and UP, SCZ showed a systematic rightward bias on LB, partially corrected by selective right posterior parietal tDCS. Interestingly, even FdR showed a lack of pseudoneglect on LB, expressing a mean error lying in the middle between those of HS and SCZ. On the other hand, our results showed no significant difference between the performance of SCZ and HS on MNL. Both groups showed a comparable leftward bias that could not be significantly altered after left or right parietal tDCS. These findings confirm the existence of reduced lateralization in SCZ, suggesting specific impaired functioning of the right parietal lobule. Notably, we report a lack of pseudoneglect not only in SCZ but also in FdR, raising the hypothesis that an inverted laterality pattern may be considered a concrete marker of schizotypal traits.
Pubblicato
Rilevanza nazionale
Articolo
Esperti anonimi
Settore MED/25 - Psichiatria
eng
Young Adult; Humans; Endophenotypes; Depressive Disorder; Parietal Lobe; Schizophrenia; Adult; Case-Control Studies; Schizophrenic Psychology; Space Perception; Family; Middle Aged; Perceptual Disorders; Female; Functional Laterality; Male
Ribolsi, M., Lisi, G., DI LORENZO, G., Koch, G., Oliveri, M., Magni, V., et al. (2013). Perceptual pseudoneglect in schizophrenia: candidate endophenotype and the role of the right parietal cortex. SCHIZOPHRENIA BULLETIN, 39(3), 601-607 [10.1093/schbul/sbs036].
Ribolsi, M; Lisi, G; DI LORENZO, G; Koch, G; Oliveri, M; Magni, V; Pezzarossa, B; Saya, A; Rociola, G; Rubino, I; Niolu, C; Siracusano, A
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
Ribolsi et al, Schizophr Bull 2013_Perceptual Pseudoneglect in Schizophrenia - Candidate Endophenotype and the Role of the Right Parietal Cortex.pdf

non disponibili

Licenza: Copyright dell'editore
Dimensione 1.25 MB
Formato Adobe PDF
1.25 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/99228
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 37
  • ???jsp.display-item.citation.isi??? 33
social impact