Abstract
Object recognition is subserved by mechanisms that seem to rely on the activity of distributed neural assemblies coordinated by synchronous firing in the gamma-band range (> 20 Hz). The present study relied on a novel EEG-compatible plane-rotation paradigm to elicit view-dependent processing leading to delays in the recognition of disoriented objects. The paradigm involved a covert naming task (grammatical gender decision). The task's suitability was first evaluated through a control experiment that contrasted covert with overt naming. The plane-rotation paradigm was subsequently employed in an EEG experiment. It was found that recognition delays for disoriented objects were accompanied by induced gamma-band activity's (GBA) peak latency delays, replicating Martinovic, Gruber and Muller (2007, journal of Cognitive Neuroscience). Brain electrical tomography was performed to obtain further information on the intracranial current density distributions underlying the latency shifts. Induced GBA was found to be generated by a set of distributed prefrontal, temporal and posterior sources committed to representational processing. Their relative contribution differed between upright and disoriented objects, as prefrontal activity became more prominent with increased disorientation. Together these findings indicate that adaptive changes in dynamic coding of object identity occur during recognition of disoriented objects. Induced GBA is a marker of pronounced sensitivity to these changes and thus a robust neural signature of representational activity in high-level vision. (C) 2007 Elsevier B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 93-106 |
| Number of pages | 14 |
| Journal | Brain Research |
| Volume | 1198 |
| Early online date | 3 Jan 2008 |
| DOIs | |
| Publication status | Published - 10 Mar 2008 |
Keywords
- gamma-band activity
- naming
- object identification
- view-dependent recognition
- EEG
- source localisation
- oscillatory brain activity
- repetition priming task
- top-down facilitation
- rotated objects
- human EEG
- familiar objects
- natural objects
- working-memory
- recognition
- responses
Cite this
Induced gamma-band activity is related to the time point of object identification. / Martinovic, Jasna; Gruber, Thomas; Hantsch, Ansgar; Mueller, Matthias M.
In: Brain Research, Vol. 1198, 10.03.2008, p. 93-106.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Induced gamma-band activity is related to the time point of object identification
AU - Martinovic, Jasna
AU - Gruber, Thomas
AU - Hantsch, Ansgar
AU - Mueller, Matthias M.
PY - 2008/3/10
Y1 - 2008/3/10
N2 - Object recognition is subserved by mechanisms that seem to rely on the activity of distributed neural assemblies coordinated by synchronous firing in the gamma-band range (> 20 Hz). The present study relied on a novel EEG-compatible plane-rotation paradigm to elicit view-dependent processing leading to delays in the recognition of disoriented objects. The paradigm involved a covert naming task (grammatical gender decision). The task's suitability was first evaluated through a control experiment that contrasted covert with overt naming. The plane-rotation paradigm was subsequently employed in an EEG experiment. It was found that recognition delays for disoriented objects were accompanied by induced gamma-band activity's (GBA) peak latency delays, replicating Martinovic, Gruber and Muller (2007, journal of Cognitive Neuroscience). Brain electrical tomography was performed to obtain further information on the intracranial current density distributions underlying the latency shifts. Induced GBA was found to be generated by a set of distributed prefrontal, temporal and posterior sources committed to representational processing. Their relative contribution differed between upright and disoriented objects, as prefrontal activity became more prominent with increased disorientation. Together these findings indicate that adaptive changes in dynamic coding of object identity occur during recognition of disoriented objects. Induced GBA is a marker of pronounced sensitivity to these changes and thus a robust neural signature of representational activity in high-level vision. (C) 2007 Elsevier B.V. All rights reserved.
AB - Object recognition is subserved by mechanisms that seem to rely on the activity of distributed neural assemblies coordinated by synchronous firing in the gamma-band range (> 20 Hz). The present study relied on a novel EEG-compatible plane-rotation paradigm to elicit view-dependent processing leading to delays in the recognition of disoriented objects. The paradigm involved a covert naming task (grammatical gender decision). The task's suitability was first evaluated through a control experiment that contrasted covert with overt naming. The plane-rotation paradigm was subsequently employed in an EEG experiment. It was found that recognition delays for disoriented objects were accompanied by induced gamma-band activity's (GBA) peak latency delays, replicating Martinovic, Gruber and Muller (2007, journal of Cognitive Neuroscience). Brain electrical tomography was performed to obtain further information on the intracranial current density distributions underlying the latency shifts. Induced GBA was found to be generated by a set of distributed prefrontal, temporal and posterior sources committed to representational processing. Their relative contribution differed between upright and disoriented objects, as prefrontal activity became more prominent with increased disorientation. Together these findings indicate that adaptive changes in dynamic coding of object identity occur during recognition of disoriented objects. Induced GBA is a marker of pronounced sensitivity to these changes and thus a robust neural signature of representational activity in high-level vision. (C) 2007 Elsevier B.V. All rights reserved.
KW - gamma-band activity
KW - naming
KW - object identification
KW - view-dependent recognition
KW - EEG
KW - source localisation
KW - oscillatory brain activity
KW - repetition priming task
KW - top-down facilitation
KW - rotated objects
KW - human EEG
KW - familiar objects
KW - natural objects
KW - working-memory
KW - recognition
KW - responses
U2 - 10.1016/j.brainres.2007.12.050
DO - 10.1016/j.brainres.2007.12.050
M3 - Article
VL - 1198
SP - 93
EP - 106
JO - Brain Research
JF - Brain Research
SN - 0006-8993
ER -