Differential BOLD activity associated with subjective and objective reports during "blindsight" in normal observers.
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Differential BOLD activity associated with subjective and objective reports during "blindsight" in normal observers. / Hesselmann, Guido; Hebart, Martin; Malach, Rafael.
in: J NEUROSCI, Jahrgang 31, Nr. 36, 36, 2011, S. 12936-12944.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Differential BOLD activity associated with subjective and objective reports during "blindsight" in normal observers.
AU - Hesselmann, Guido
AU - Hebart, Martin
AU - Malach, Rafael
PY - 2011
Y1 - 2011
N2 - The study of conscious visual perception invariably necessitates some means of report. Report can be either subjective, i.e., an introspective evaluation of conscious experience, or objective, i.e., a forced-choice discrimination regarding different stimulus states. However, the link between report type and fMRI-BOLD signals has remained unknown. Here we used continuous flash suppression to render target images invisible, and observed a long-lasting dissociation between subjective report of visibility and human subjects' forced-choice localization of targets ("blindsight"). Our results show a robust dissociation between brain regions and type of report. We find subjective visibility effects in high-order visual areas even under equal objective performance. No significant BOLD difference was found between correct and incorrect trials in these areas when subjective report was constant. On the other hand, objective performance was linked to the accuracy of multivariate pattern classification mainly in early visual areas. Together, our data support the notion that subjective and objective reports tap cortical signals of different location and amplitude within the visual cortex.
AB - The study of conscious visual perception invariably necessitates some means of report. Report can be either subjective, i.e., an introspective evaluation of conscious experience, or objective, i.e., a forced-choice discrimination regarding different stimulus states. However, the link between report type and fMRI-BOLD signals has remained unknown. Here we used continuous flash suppression to render target images invisible, and observed a long-lasting dissociation between subjective report of visibility and human subjects' forced-choice localization of targets ("blindsight"). Our results show a robust dissociation between brain regions and type of report. We find subjective visibility effects in high-order visual areas even under equal objective performance. No significant BOLD difference was found between correct and incorrect trials in these areas when subjective report was constant. On the other hand, objective performance was linked to the accuracy of multivariate pattern classification mainly in early visual areas. Together, our data support the notion that subjective and objective reports tap cortical signals of different location and amplitude within the visual cortex.
KW - Adult
KW - Humans
KW - Male
KW - Female
KW - Young Adult
KW - Multivariate Analysis
KW - Photic Stimulation
KW - Magnetic Resonance Imaging
KW - Data Interpretation, Statistical
KW - Psychomotor Performance/physiology
KW - Visual Cortex/physiology
KW - Blindness/physiopathology
KW - Brain Chemistry/physiology
KW - Cerebral Cortex/physiology
KW - Oxygen/blood
KW - Retina/physiology
KW - Vision, Ocular/physiology
KW - Visual Pathways/physiology
KW - Adult
KW - Humans
KW - Male
KW - Female
KW - Young Adult
KW - Multivariate Analysis
KW - Photic Stimulation
KW - Magnetic Resonance Imaging
KW - Data Interpretation, Statistical
KW - Psychomotor Performance/physiology
KW - Visual Cortex/physiology
KW - Blindness/physiopathology
KW - Brain Chemistry/physiology
KW - Cerebral Cortex/physiology
KW - Oxygen/blood
KW - Retina/physiology
KW - Vision, Ocular/physiology
KW - Visual Pathways/physiology
M3 - SCORING: Journal article
VL - 31
SP - 12936
EP - 12944
JO - J NEUROSCI
JF - J NEUROSCI
SN - 0270-6474
IS - 36
M1 - 36
ER -
