The psychological refractory period effect following callosotomy: uncoupling of lateralized response codes

Journal of Experimental Psychology. Human Perception and Performance
R B IvryJ C Johnston

Abstract

A callosotomy patient was tested in 2 dual-task experiments requiring successive speeded responses to lateralized stimuli. The patient showed a robust psychological refractory period (PRP) effect. Three aspects of the data indicate that, unlike for the control participants, the PRP effect for the split-brain patient should not be attributed to a response selection bottleneck. First, the patient did not show an increase in reaction time (RT) when the 2 tasks required responses from a common output system compared with when different output systems were used. Second, inconsistent stimulus-response mappings for the 2 tasks increased RTs for the control participants but had minimal effect on the performance of the split-brain patient. Third, the consistency manipulation was underadditive with stimulus onset asynchrony but was additive or overadditive for the normal participants. These results suggest that the persistent PRP effect following callosotomy should be attributed to a bottleneck associated with response initiation, a strategy adopted to comply with the task demands, or a combination of these factors.

Citations

Jun 1, 2005·Trends in Cognitive Sciences·René Marois, Jason Ivanoff
Oct 17, 2003·Brain Research. Cognitive Brain Research·Torsten Schubert, Andre J Szameitat
Dec 24, 2002·Journal of Cognitive Neuroscience·Michael C CorballisPaul M Corballis
Oct 10, 2003·Journal of Neurophysiology·Jörn DiedrichsenRichard B Ivry
May 12, 2009·Attention, Perception & Psychophysics·Robert W Proctor, Kim-Phuong L Vu
Jul 18, 2002·Psychonomic Bulletin & Review·Mei-Ching Lien, Robert W Proctor
Nov 17, 2007·Journal of Cognitive Neuroscience·Eliot HazeltineRichard B Ivry
Jan 1, 2005·Cognitive Neuropsychology·R Dell'acquaA Pascali
Mar 27, 2002·Nature Neuroscience·Steven W KennerleyRichard B Ivry
Sep 8, 2001·The Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology·B GiesbrechtA Kingstone

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