September 2005
Volume 5, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   September 2005
Temporary bilateral deficit of transient visual attention after right inferior parietal lobe surgery: A single case study
Author Affiliations
  • Lorella Battelli
    Laboratory for Magnetic Brain Stimulation, Beth Israel Hospital, Boston, MAUSA, and Department of Psychology, Harvard University, Cambridge, MAUSA
  • Patrick Cavanagh
    Department of Psychology, Harvard University, Cambridge, MAUSA
  • Donald L. Schomer
    Laboratory of Clinical Neurophysiology, Beth Israel Hospital, Boston, MAUSA
  • Jason J. S. Barton
    Human Vision and Eye Movements Laboratory, University of British Columbia, CA
Journal of Vision September 2005, Vol.5, 684. doi:10.1167/5.8.684
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      Lorella Battelli, Patrick Cavanagh, Donald L. Schomer, Jason J. S. Barton; Temporary bilateral deficit of transient visual attention after right inferior parietal lobe surgery: A single case study. Journal of Vision 2005;5(8):684. doi: 10.1167/5.8.684.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: We have previously shown that right parietal patients are impaired at performing attentive tasks of apparent motion and phase discrimination in both visual fields, not just the left field where they show other attention-related deficits. Left parietal patients performed normally in these tasks. We hypothesized that the right parietal lobe ought to play a selective role in tasks of visual timing. We studied a patient affected by medication-intractable, parietal lobe epilepsy, testing her before and immediately after her right inferior parietal lobe was removed in order to alleviate her seizure episodes. Method: We devised a battery of seven psychophysical experiments and tested the patient two days before and four days after surgery. We also did a follow-up testing at 9, 68 and 103 days post surgery. We tested her on low-level and high-level motion tasks such us apparent motion, visual tracking and biological motion. Furthermore we tested her on a phase discrimination experiment where six squares (three in each visual field) were flickering at the same temporal frequency and the target to be detected was flickering out of phase. The stimuli were reversed sinusoidally at temporal frequencies varying from 2–9 Hz. We used the method of adjustment and varied the temporal frequency progressively until the subject reported the target correctly. Results: The patient showed a severe loss in both hemifields in the phase discrimination task four days after surgery, while her low-level and high-level motion tasks were all within the normal limits immediately after surgery. She showed a significant improvement in the phase discrimination task 9 days post-surgery and she performed normally at 103 days post-surgery. Biological motion was mildly impaired at 4 days but recovered by 9 days post-surgery. Conclusion: Since the patient detected flicker normally, we conclude that the severe temporary deficit she showed immediately after surgery affects a higher level of processing possibly where attentional mechanisms assign transient onsets and offsets to the appearance and disappearance of objects.

Battelli, L. Cavanagh, P. Schomer, D. L. Barton, J. J. S. (2005). Temporary bilateral deficit of transient visual attention after right inferior parietal lobe surgery: A single case study [Abstract]. Journal of Vision, 5(8):684, 684a, http://journalofvision.org/5/8/684/, doi:10.1167/5.8.684. [CrossRef]
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