Failure to Activate the Left Temporoparietal Cortex in Dyslexia: An Oxygen 15 Positron Emission Tomographic Study
• To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was measured with positron emission tomography in 14 right-handed men with severe developmental dyslexia (mean [SD] age, 27 [5] years; median readin...
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Published in | Archives of neurology (Chicago) Vol. 49; no. 5; pp. 527 - 534 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Chicago, IL
American Medical Association
01.05.1992
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Subjects | |
Online Access | Get full text |
ISSN | 0003-9942 1538-3687 |
DOI | 10.1001/archneur.1992.00530290115020 |
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Abstract | • To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was measured with positron emission tomography in 14 right-handed men with severe developmental dyslexia (mean [SD] age, 27 [5] years; median reading level, fifth grade) and 14 matched controls at rest and during an auditory phonologic task (rhyme detection) and an auditory attention task involving the detection of target tones. As expected, normal readers activated left temporoparietal cortex during rhyme detection but not during the nonphonologic attentional task. Dyslexic men failed to activate those left temporoparietal regions activated in controls during rhyme detection but did not differ from controls in these regions during rest or attentional testing. Thus, the expected left temporoparietal dysfunction was demonstrated only when specific probes for these regions were employed. |
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AbstractList | To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was measured with positron emission tomography in 14 right-handed men with severe developmental dyslexia (mean [SD] age, 27 [5] years; median reading level, fifth grade) and 14 matched controls at rest and during an auditory phonologic task (rhyme detection) and an auditory attention task involving the detection of target tones. As expected, normal readers activated left temporoparietal cortex during rhyme detection but not during the nonphonologic attentional task. Dyslexic men failed to activate those left temporoparietal regions activated in controls during rhyme detection but did not differ from controls in these regions during rest or attentional testing. Thus, the expected left temporoparietal dysfunction was demonstrated only when specific probes for these regions were employed. • To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was measured with positron emission tomography in 14 right-handed men with severe developmental dyslexia (mean [SD] age, 27 [5] years; median reading level, fifth grade) and 14 matched controls at rest and during an auditory phonologic task (rhyme detection) and an auditory attention task involving the detection of target tones. As expected, normal readers activated left temporoparietal cortex during rhyme detection but not during the nonphonologic attentional task. Dyslexic men failed to activate those left temporoparietal regions activated in controls during rhyme detection but did not differ from controls in these regions during rest or attentional testing. Thus, the expected left temporoparietal dysfunction was demonstrated only when specific probes for these regions were employed. To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was measured with positron emission tomography in 14 right-handed men with severe developmental dyslexia (mean [SD] age, 27 [5] years; median reading level, fifth grade) and 14 matched controls at rest and during an auditory phonologic task (rhyme detection) and an auditory attention task involving the detection of target tones. As expected, normal readers activated left temporoparietal cortex during rhyme detection but not during the nonphonologic attentional task. Dyslexic men failed to activate those left temporoparietal regions activated in controls during rhyme detection but did not differ from controls in these regions during rest or attentional testing. Thus, the expected left temporoparietal dysfunction was demonstrated only when specific probes for these regions were employed.To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was measured with positron emission tomography in 14 right-handed men with severe developmental dyslexia (mean [SD] age, 27 [5] years; median reading level, fifth grade) and 14 matched controls at rest and during an auditory phonologic task (rhyme detection) and an auditory attention task involving the detection of target tones. As expected, normal readers activated left temporoparietal cortex during rhyme detection but not during the nonphonologic attentional task. Dyslexic men failed to activate those left temporoparietal regions activated in controls during rhyme detection but did not differ from controls in these regions during rest or attentional testing. Thus, the expected left temporoparietal dysfunction was demonstrated only when specific probes for these regions were employed. |
Author | Aquino, Tracy King, A. Catherine Pikus, Anita Andreason, Paul Hamburger, Susan D Rapoport, Judith L Cohen, Robert M Rumsey, Judith M Zametkin, Alan J |
Author_xml | – sequence: 1 givenname: Judith M surname: Rumsey fullname: Rumsey, Judith M – sequence: 2 givenname: Paul surname: Andreason fullname: Andreason, Paul – sequence: 3 givenname: Alan J surname: Zametkin fullname: Zametkin, Alan J – sequence: 4 givenname: Tracy surname: Aquino fullname: Aquino, Tracy – sequence: 5 givenname: A. Catherine surname: King fullname: King, A. Catherine – sequence: 6 givenname: Susan D surname: Hamburger fullname: Hamburger, Susan D – sequence: 7 givenname: Anita surname: Pikus fullname: Pikus, Anita – sequence: 8 givenname: Judith L surname: Rapoport fullname: Rapoport, Judith L – sequence: 9 givenname: Robert M surname: Cohen fullname: Cohen, Robert M |
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Keywords | Human Radionuclide study Regional blood flow Nervous system diseases Oxygen Pathogenesis Temporal cortex Language disorder Communication disorder Young adult Parietal cortex Dyslexia Hemodynamics Neurological disorder Positron emission tomography Brain (vertebrata) Positron |
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Snippet | • To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was... To test the hypothesis of left temporoparietal dysfunction in dyslexia, suggested by neuropsychological and neuropathologic data, cerebral blood flow was... |
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SubjectTerms | Adult Biological and medical sciences Cerebrovascular Circulation Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes Dominance, Cerebral Dyslexia - physiopathology Humans Male Medical sciences Nervous system (semeiology, syndromes) Neurology Neuropsychological Tests Oxygen Radioisotopes Parietal Lobe - diagnostic imaging Parietal Lobe - physiopathology Reading Temporal Lobe - diagnostic imaging Temporal Lobe - physiopathology Tomography, Emission-Computed |
Title | Failure to Activate the Left Temporoparietal Cortex in Dyslexia: An Oxygen 15 Positron Emission Tomographic Study |
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