Cited by 219Visual perception and processing mechanismsMotor Control and AdaptationVestibular and auditory disorders

Electrical Microstimulation Distinguishes Distinct Saccade-Related Areas in the Posterior Parietal Cortex

Thier, Peter, Andersen, Richard A.·1998·Journal of Neurophysiology

Abstract

Thier, Peter and Richard A. Andersen. Electrical microstimulation distinguishes distinct saccade-related areas in the posterior parietal cortex. J. Neurophysiol. 80: 1713–1735, 1998. Electrical microstimulation (0.1-ms bipolar pulses at 500 Hz, current strength usually between 100 and 200 μA) was used to delineate saccade-related areas in the posterior parietal cortex of monkeys. Stimulation-induced saccades were found to be restricted to the lateral intraparietal area (area LIP) in the intraparietal sulcus (IPS) and a region on the medial aspect of the parietal lobe (area MP, medial parietal area), close to the caudal end of the cingulate sulcus, whereas stimulation of area 7a did not evoke eye movements. Two different types of evoked saccades were observed. Modified vector saccades, whose amplitude was modified by the position of the eyes at stimulation onset were the hallmark of sites in area LIP and area MP. The same sites were characterized by a propensity of single units active in the memory and presaccadic response segments of the memory saccade paradigm. Goal-directed saccades driving the eyes toward a circumscribed region relative to the head were largely restricted to a small strip of cortex on the lateral bank and the floor of the IPS (the intercalated zone), separating the representation of upward and downward directed saccades in LIP. Unlike stimulation in LIP or MP, stimulation in the intercalated zone gave rise to head, pinnae, facial, and shoulder movements accompanying the evoked saccades. We propose that the amplitude modification of vector saccades characterizing LIP and MP may reflect a spatially distributed head-centered coding scheme for saccades. On the other hand, the goal-directed saccades found in the intercalated zone could indicate the use of a spatially much more localized representation of desired location in head-centered space.

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Crossref · 10.1152/jn.1998.80.4.1713

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Authors
Thier, P., & Andersen, R. A.
Affiliations
  • Universitätsklinikum Tübingen (DE)
  • Massachusetts Institute of Technology (US)
Venue
Journal of Neurophysiology
Published
1998-10-01
Volume
80
Issue
4
Pages
1713-1735
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2200160905
Cited by
219
References
58
Citations by year
2026: 2 · 2025: 5 · 2024: 12 · 2023: 9 · 2022: 3 · 2021: 12 · 2020: 8 · 2019: 3 · 2018: 9 · 2017: 7 · 2016: 6 · 2015: 6 · 2014: 8 · 2013: 15 · 2012: 11
FWCI
2.55
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
  • Life Sciences › Neuroscience › Neurology › Vestibular and auditory disorders
Keywords
saccades, electrical microstimulation, posterior parietal cortex, lateral intraparietal area, intraparietal sulcus, eye movements
MeSH terms
Animals, Haplorhini, Brain Mapping, Electric Stimulation, Electrophysiology, Head, Movement, Neurons, Orbit, Parietal Lobe, Posture, Reaction Time, Saccades

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