Optokinetic stimulation and the egocentred midsagittal plane: an fMRI study.
Animal studies and observations of neglect patients suggest that the posterior parietal cortex is part of a system that codes ego-centred space. Few studies show the existence of areas involved in the representation of egocentred space in healthy humans. We investigated with fMRI and a conjunction protocol, the overlap of activity between optokinetic stimulation and a task of midline computation. Results showed that the right posterior parietal and frontal cortices were involved in both tasks (p < 0.0001). The evidence presented in this study provides the neuroanatomical substrate involved in the recovery of neglect during vestibular stimulation. This last point is of clinical interest for the rehabilitation of hemineglect.
Boileau
Isabelle
I
Departement de Radiologie, Faculté de Médecine, Université de Montreal, QC, Canada.
Beauregar
Mario
M
Beuter
Anne
A
Breault
Claude
C
Lecours
André Roch
AR
D000328:Adult; D016000:Cluster Analysis; D005625:Frontal Lobe / Q000502:physiology; D006358:Hot Temperature; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D017120:Nystagmus, Optokinetic / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D010296:Parietal Lobe / Q000166:cytology / Q000502:physiology; D011930:Reaction Time; D013028:Space Perception / Q000502:physiology*; D014722:Vestibule, Labyrinth / Q000502:physiology