Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception
To isolate neural correlates of conscious perception (NCCs), a standard approach has been to contrast neural activity elicited by identical stimuli of which subjects are aware versus unaware. Because conscious experience is private, determining whether a stimulus was consciously perceived requires s...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2014-10-01
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| Series: | Frontiers in Psychology |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fpsyg.2014.01078/full |
| _version_ | 1818517887787204608 |
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| author | Michael A Pitts Stephen eMetzler Steven eHillyard |
| author_facet | Michael A Pitts Stephen eMetzler Steven eHillyard |
| author_sort | Michael A Pitts |
| collection | DOAJ |
| description | To isolate neural correlates of conscious perception (NCCs), a standard approach has been to contrast neural activity elicited by identical stimuli of which subjects are aware versus unaware. Because conscious experience is private, determining whether a stimulus was consciously perceived requires subjective report: e.g., button-presses indicating detection, visibility ratings, verbal reports, etc. This reporting requirement introduces a methodological confound when attempting to isolate NCCs: The neural processes responsible for accessing and reporting one’s percept are difficult to distinguish from those underlying the conscious percept itself. Here, we review recent attempts to circumvent this issue via a modified inattentional blindness paradigm (Pitts, Martinez, & Hillyard, 2012) and present new data from a backward masking experiment in which task-relevance and visual awareness were manipulated in a 2x2 crossed design. In agreement with our previous inattentional blindness results, stimuli that were consciously perceived yet not immediately accessed for report (aware, task-irrelevant condition) elicited a mid-latency posterior ERP negativity (~200-240ms), while stimuli that were accessed for report (aware, task-relevant condition) elicited additional components including a robust P3b (~380-480ms) subsequent to the mid-latency negativity. Overall, these results suggest that some of the NCCs identified in previous studies may be more closely linked with accessing and maintaining perceptual information for reporting purposes than with encoding the conscious percept itself. An open question is whether the remaining NCC candidate (the ERP negativity at 200-240ms) reflects visual awareness or object-based attention. |
| first_indexed | 2024-12-11T01:02:20Z |
| format | Article |
| id | doaj.art-32a7c3ce689b4d3c8de67a52d8e8b1ed |
| institution | Directory Open Access Journal |
| issn | 1664-1078 |
| language | English |
| last_indexed | 2024-12-11T01:02:20Z |
| publishDate | 2014-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Psychology |
| spelling | doaj.art-32a7c3ce689b4d3c8de67a52d8e8b1ed2022-12-22T01:26:17ZengFrontiers Media S.A.Frontiers in Psychology1664-10782014-10-01510.3389/fpsyg.2014.01078105150Isolating neural correlates of conscious perception from neural correlates of reporting one’s perceptionMichael A Pitts0Stephen eMetzler1Steven eHillyard2Reed CollegeReed CollegeUniversity of California San DiegoTo isolate neural correlates of conscious perception (NCCs), a standard approach has been to contrast neural activity elicited by identical stimuli of which subjects are aware versus unaware. Because conscious experience is private, determining whether a stimulus was consciously perceived requires subjective report: e.g., button-presses indicating detection, visibility ratings, verbal reports, etc. This reporting requirement introduces a methodological confound when attempting to isolate NCCs: The neural processes responsible for accessing and reporting one’s percept are difficult to distinguish from those underlying the conscious percept itself. Here, we review recent attempts to circumvent this issue via a modified inattentional blindness paradigm (Pitts, Martinez, & Hillyard, 2012) and present new data from a backward masking experiment in which task-relevance and visual awareness were manipulated in a 2x2 crossed design. In agreement with our previous inattentional blindness results, stimuli that were consciously perceived yet not immediately accessed for report (aware, task-irrelevant condition) elicited a mid-latency posterior ERP negativity (~200-240ms), while stimuli that were accessed for report (aware, task-relevant condition) elicited additional components including a robust P3b (~380-480ms) subsequent to the mid-latency negativity. Overall, these results suggest that some of the NCCs identified in previous studies may be more closely linked with accessing and maintaining perceptual information for reporting purposes than with encoding the conscious percept itself. An open question is whether the remaining NCC candidate (the ERP negativity at 200-240ms) reflects visual awareness or object-based attention.http://journal.frontiersin.org/Journal/10.3389/fpsyg.2014.01078/fullAttentionAwarenessvanmaskingP3btask-relevance |
| spellingShingle | Michael A Pitts Stephen eMetzler Steven eHillyard Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception Frontiers in Psychology Attention Awareness van masking P3b task-relevance |
| title | Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception |
| title_full | Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception |
| title_fullStr | Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception |
| title_full_unstemmed | Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception |
| title_short | Isolating neural correlates of conscious perception from neural correlates of reporting one’s perception |
| title_sort | isolating neural correlates of conscious perception from neural correlates of reporting one s perception |
| topic | Attention Awareness van masking P3b task-relevance |
| url | http://journal.frontiersin.org/Journal/10.3389/fpsyg.2014.01078/full |
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