Bandpass characteristics of high-frequency sensitivity and visual experience in blindsight |
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| Authors: | Doerthe Seifert Christine Falter Hans Strasburger Mark A Elliott |
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| Institution: | 1. Ludwig-Maximilians-Universität München, Department of Psychology: General and Experimental Psychology, Leopoldstr. 13, 80802 Munich, Germany;2. Martin-Luther-Universität of Halle-Wittenberg, Department of Psychiatry, Psychotherapy and Psychosomatics, Julius-Kühn-Straße 7, 06112 Halle a.d. Saale, Germany;3. Department of Psychiatry, Oxford University, Warneford Hospital, Oxford, OX3 7JX, United Kingdom;4. Georg-August-Universität Göttingen, Department of Medical Psychology, Waldweg 37, D-37073 Göttingen, Germany;5. Ludwig-Maximilians-Universität München, Institute for Medical Psychology, Goethestr. 31/I, D-80336, Munich, Germany;6. School of Psychology, National University of Ireland, Galway, Ireland;2. Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel;3. Pediatric Ophthalmology Unit, Schneider Children’s Medical Center of Israel, Petach Tikva, Israel;4. Department of Oncology, Schneider Children’s Medical Center of Israel, Petach Tikva, Israel;5. Department of Neurosurgery, Schneider Children’s Medical Center of Israel, Petach Tikva, Israel;1. State Key Laboratory of Software Development Environment, School of Computer Science and Engineering, Beihang University, Beijing 100191, China;2. School of Computer Science, University of Oklahoma, Norman, OK 73019-6151, USA;1. Vanderbilt University, Department of Psychology, United States;2. Vanderbilt University School of Medicine, Department of Hearing and Speech Sciences, United States;3. Vanderbilt University School of Medicine, Department of Psychology, United States;4. Vanderbilt University, Department of Cell and Molecular Biology, United States;1. Department of Mathematics, University of Osijek, Trg Lj. Gaja 6, HR – 31 000 Osijek, Croatia;2. Faculty of Civil Engineering, University of Osijek, Crkvena 21, HR – 31 000 Osijek, Croatia |
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| Abstract: | Patient RP suffers a unilateral right homonymous quadrant anopia but demonstrates better than chance discrimination for stimuli presented in the blind field at temporal frequencies between 33 and 47 Hz (all significant at p < .05, binomial). Examination of her reports of visual experience during blind-field discrimination suggests a more complex picture in which experiences particular to correct discrimination are not found at low-mid-gamma frequencies, but are significantly more likely than average (76%, p < .001) at a lower frequency (22 Hz) at which blindsight is not observed. We believe that visual experience may serve to support blindsight if discrimination tasks are generally impaired at frequencies outside of the low-mid-gamma band. If this is so, although generally experienced as non-specific and unstructured light, the visual experience that accompanies discrimination performance must be based upon a neural representation which includes information on the visual features present in the stimulus. |
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