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The effects of between���source discriminability on attended and unattended auditory ERPs

Journal Article


Abstract


  • Event���related potentials (ERPs) for tone pips from attended and unattended sources, which varied on discriminability, were compared with ERPs for the same stimuli recorded during performance of a visual task. This comparison revealed that Nd, the negative shift of attended relative to unattended ERPs, consisted of three components: a negativity in the attended ERP from 100 to 270 ms, a positivity in the unattended ERP from 170 ms to the end of the epoch, and a second negativity in the attended ERP from 270 to 700 ms. In general, the later onset of early Nd with more difficult between���source discriminations could be attributed to the later onset of the positivity in unattended ERPs. A number of hypotheses were advanced for the origin of the unattended positivity: the suppression of the later of two negative components in the 100���220���ms range, an enhanced P2 component, an endogenous positivity, or the resolution of a protracted negativity elicited by preceding attended stimuli. Copyright �� 1993, Wiley Blackwell. All rights reserved

Publication Date


  • 1993

Citation


  • MICHIE, P. T., SOLOWIJ, N., CRAWFORD, J. M., & GLUE, L. C. (1993). The effects of between���source discriminability on attended and unattended auditory ERPs. Psychophysiology, 30(2), 205-220. doi:10.1111/j.1469-8986.1993.tb01733.x

Scopus Eid


  • 2-s2.0-0027516431

Start Page


  • 205

End Page


  • 220

Volume


  • 30

Issue


  • 2

Place Of Publication


Abstract


  • Event���related potentials (ERPs) for tone pips from attended and unattended sources, which varied on discriminability, were compared with ERPs for the same stimuli recorded during performance of a visual task. This comparison revealed that Nd, the negative shift of attended relative to unattended ERPs, consisted of three components: a negativity in the attended ERP from 100 to 270 ms, a positivity in the unattended ERP from 170 ms to the end of the epoch, and a second negativity in the attended ERP from 270 to 700 ms. In general, the later onset of early Nd with more difficult between���source discriminations could be attributed to the later onset of the positivity in unattended ERPs. A number of hypotheses were advanced for the origin of the unattended positivity: the suppression of the later of two negative components in the 100���220���ms range, an enhanced P2 component, an endogenous positivity, or the resolution of a protracted negativity elicited by preceding attended stimuli. Copyright �� 1993, Wiley Blackwell. All rights reserved

Publication Date


  • 1993

Citation


  • MICHIE, P. T., SOLOWIJ, N., CRAWFORD, J. M., & GLUE, L. C. (1993). The effects of between���source discriminability on attended and unattended auditory ERPs. Psychophysiology, 30(2), 205-220. doi:10.1111/j.1469-8986.1993.tb01733.x

Scopus Eid


  • 2-s2.0-0027516431

Start Page


  • 205

End Page


  • 220

Volume


  • 30

Issue


  • 2

Place Of Publication