P300, probability,and the three-tone paradigm |
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| Affiliation: | 1. Faculty of Education, Hokkaido University, Sapporo 060, Japan;2. Department of Neuropharmacology TPC-10, The Scripps Research Institute, 10666 North Torrey Pines Road, La Jolla, CA 92037, USA;1. Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, Rome 00135, Italy;2. Department of Psychology, University of Rome “La Sapienza”, Rome, Italy;3. IRCCS Santa Lucia Foundation, Rome 00179, Italy;1. Département de musique, Faculté des arts, Université du Québec à Montréal, Case postale 8888, succ. Centre-Ville, Montréal, Québec H3C 3P8, Canada;2. Département des sciences de l’activité physique, Faculté des sciences, Université du Québec à Montréal, Case postale 8888, succ. Centre-ville, Montréal, Québec H3C 3P8, Canada;1. Department of Brain and Cognitive Sciences and Center for Visual Science, University of Rochester, Meliora Hall, Rochester, NY 14627, United States;2. Department of Neurology, University of Rochester Medical Center, 601 Elmwood Avenue, Box 673, Rochester, NY 14642, United States |
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| Abstract: | The effects of stimulus probability on P300 from a 3-tone paradigm were examined in two experiments. Experiment 1 manipulated the probability of the non-target tone as 0.10, 0.45, or 0.80, while the target tone probability was always 0.10. Experiment 2 manipulated the probability of 3 tones as 0.10, 0.30, or 0.60, with one of the infrequent tones assigned as the target in each condition. Subjects were required to press a button in response to the target stimulus in both experiments. The results indicated that the P300 to the target and the non-target were both affected by the probability of the eliciting stimulus, such that component amplitude was inversely related to probability; no reliable P300 latency effects were found. Target tones elicited larger P300 amplitude than the non-target tones at the same probability. The findings suggest that probability effects on P300 amplitude are independent of responding to a specific target stimulus and are discussed with reference to the clinical utility of the 3-tone paradigm. |
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