Neural control of fast-regular saccades and antisaccades: An investigation using positron emission tomography

Fabrizio Doricchi, Daniela Perani, Chiara Incoccia, Franco Grassi, Stefano F. Cappa, Valentino Bettinardi, Gaspare Galati, Luigi Pizzamiglio, Ferruccio Fazio

Research output: Contribution to journalArticlepeer-review

Abstract

Regional cerebral blood flow changes related to the performance of two oculomotor tasks and a central fixation task were compared in ten healthy human subjects. The tasks were: (a) performance of fast-regular saccades; (b) performance of voluntary antisaccades away from a peripheral cue; (c) passive maintenance of central visual fixation in the presence of irrelevant peripheral stimulation. The saccadic task was associated with a relative increase in activity in a number of occipitotemporal areas. Compared with both the fixation and the saccadic task, the performance of antisaccades activated a set of areas including: the superior and inferior parietal lobules, the precentral and prefrontal cortex, the cingulate cortex, and the supplementary motor area. The results of the present study suggest that: (a) compared with self-determined saccadic responses the performance of fast regular, reflexive saccades produces a limited activation of the frontal eye fields; (b) in the antisaccadic task the inferior parietal lobes subserve operations of sensory-motor integration dealing with attentional disengagement from the initial peripheral cue (appearing at an invalid spatial location) and with the recomputation of the antisaccadic vector on the basis of the wrong (e.g., spatially opposite) information provided by the same cue.

Original languageEnglish
Pages (from-to)50-62
Number of pages13
JournalExperimental Brain Research
Volume116
Issue number1
DOIs
Publication statusPublished - 1997

Keywords

  • Attentional disengagement
  • Frontal eye fields
  • Parietal lobe
  • PET
  • Saccades

ASJC Scopus subject areas

  • Neuroscience(all)

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