Phase noise reveals early category-specific modulation of the event-related potentials
Previous studies have found that the amplitude of the early event-related potential (ERP) components evoked by faces, such as N170 and P2, changes systematically as a function of noise added to the stimuli. This change has been linked to an increased perceptual processing demand and to enhanced diff...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2014-04-01
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| Series: | Frontiers in Psychology |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fpsyg.2014.00367/full |
| _version_ | 1828528999142260736 |
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| author | Kornél eNémeth Petra eKovács Pál eVakli Gyula eKovács Gyula eKovács Gyula eKovács Márta eZimmer |
| author_facet | Kornél eNémeth Petra eKovács Pál eVakli Gyula eKovács Gyula eKovács Gyula eKovács Márta eZimmer |
| author_sort | Kornél eNémeth |
| collection | DOAJ |
| description | Previous studies have found that the amplitude of the early event-related potential (ERP) components evoked by faces, such as N170 and P2, changes systematically as a function of noise added to the stimuli. This change has been linked to an increased perceptual processing demand and to enhanced difficulty in perceptual decision making about faces. However, to date it has not yet been tested whether noise manipulation affects the neural correlates of decisions about face and non-face stimuli similarly. To this end, we measured the event-related potentials for faces and cars at three different phase noise levels. Subjects performed the same two-alternative age-discrimination task on stimuli chosen from young-old morphing continua that were created from faces as well as cars and were calibrated to lead to similar performances at each noise-level. Adding phase noise to the stimuli reduced performance and enhanced response latency for the two categories to the same extent. Parallel to that, phase noise reduced the amplitude and prolonged the latency of the face-specific N170 component. The amplitude of the P1 showed category-specific noise dependence: it was enhanced over the right hemisphere for cars and over the left hemisphere for faces as a result of adding phase noise to the stimuli, but remained stable across noise levels for cars over the left and for faces over the right hemisphere. Moreover, noise modulation altered the category-selectivity of the N170, while the P2 ERP component, typically associated with task decision difficulty, was larger for the more noisy stimuli regardless of stimulus category. Our results suggest that the category-specificity of noise-induced modulations of ERP responses starts at around 100 ms post-stimulus. |
| first_indexed | 2024-12-11T22:00:45Z |
| format | Article |
| id | doaj.art-8010b63563cc4f5ba8d05481d4280150 |
| institution | Directory Open Access Journal |
| issn | 1664-1078 |
| language | English |
| last_indexed | 2024-12-11T22:00:45Z |
| publishDate | 2014-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Psychology |
| spelling | doaj.art-8010b63563cc4f5ba8d05481d42801502022-12-22T00:49:06ZengFrontiers Media S.A.Frontiers in Psychology1664-10782014-04-01510.3389/fpsyg.2014.0036776585Phase noise reveals early category-specific modulation of the event-related potentialsKornél eNémeth0Petra eKovács1Pál eVakli2Gyula eKovács3Gyula eKovács4Gyula eKovács5Márta eZimmer6Budapest University of Technology and Economics (BME)Budapest University of Technology and Economics (BME)Budapest University of Technology and Economics (BME)Budapest University of Technology and Economics (BME)Friedrich Schiller University of JenaFriedrich Schiller University of JenaBudapest University of Technology and Economics (BME)Previous studies have found that the amplitude of the early event-related potential (ERP) components evoked by faces, such as N170 and P2, changes systematically as a function of noise added to the stimuli. This change has been linked to an increased perceptual processing demand and to enhanced difficulty in perceptual decision making about faces. However, to date it has not yet been tested whether noise manipulation affects the neural correlates of decisions about face and non-face stimuli similarly. To this end, we measured the event-related potentials for faces and cars at three different phase noise levels. Subjects performed the same two-alternative age-discrimination task on stimuli chosen from young-old morphing continua that were created from faces as well as cars and were calibrated to lead to similar performances at each noise-level. Adding phase noise to the stimuli reduced performance and enhanced response latency for the two categories to the same extent. Parallel to that, phase noise reduced the amplitude and prolonged the latency of the face-specific N170 component. The amplitude of the P1 showed category-specific noise dependence: it was enhanced over the right hemisphere for cars and over the left hemisphere for faces as a result of adding phase noise to the stimuli, but remained stable across noise levels for cars over the left and for faces over the right hemisphere. Moreover, noise modulation altered the category-selectivity of the N170, while the P2 ERP component, typically associated with task decision difficulty, was larger for the more noisy stimuli regardless of stimulus category. Our results suggest that the category-specificity of noise-induced modulations of ERP responses starts at around 100 ms post-stimulus.http://journal.frontiersin.org/Journal/10.3389/fpsyg.2014.00367/fullP1N170P2category effectphase noise |
| spellingShingle | Kornél eNémeth Petra eKovács Pál eVakli Gyula eKovács Gyula eKovács Gyula eKovács Márta eZimmer Phase noise reveals early category-specific modulation of the event-related potentials Frontiers in Psychology P1 N170 P2 category effect phase noise |
| title | Phase noise reveals early category-specific modulation of the event-related potentials |
| title_full | Phase noise reveals early category-specific modulation of the event-related potentials |
| title_fullStr | Phase noise reveals early category-specific modulation of the event-related potentials |
| title_full_unstemmed | Phase noise reveals early category-specific modulation of the event-related potentials |
| title_short | Phase noise reveals early category-specific modulation of the event-related potentials |
| title_sort | phase noise reveals early category specific modulation of the event related potentials |
| topic | P1 N170 P2 category effect phase noise |
| url | http://journal.frontiersin.org/Journal/10.3389/fpsyg.2014.00367/full |
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