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Classic identity negative priming involves accessing semantic representations in the left anterior temporal cortex
Greig de Zubicaray1, Katie McMahon, Mathew Eastburn
1Centre for Magnetic Resonance, The University of Queensland, QLD, 4072, Australia. greig.dezubicaray@cmr.uq.edu.au
Neuroimage
|August 16, 2006
Summary
Negative priming (NP) occurs when ignored items are responded to slower. This study found the anterior temporal cortex is involved in NP, suggesting semantic processing plays a role in this cognitive phenomenon.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Semantic Cognition
Background:
- Classic identity negative priming (NP) demonstrates slower responses to previously ignored objects.
- The role of abstract semantic representations in NP remains unclear.
- Connectionist models implicate the anterior temporal cortex in abstract semantic knowledge.
Purpose of the Study:
- To investigate whether abstract semantic representations are involved in the identity negative priming (NP) task.
- To determine the neural correlates of NP, specifically examining the role of the anterior temporal cortex.
Main Methods:
- Event-related functional magnetic resonance imaging (fMRI) at high field (4 T) was employed.
- Participants performed a classic identity negative priming (NP) task.
- Blood-oxygen-level-dependent (BOLD) responses were analyzed in relation to the NP effect.
Main Results:
- Increased BOLD responses were observed in the left anterolateral temporal cortex, including the temporal pole.
- These temporal cortex activations correlated with the magnitude of individual NP effects, supporting a semantic locus.
- Additional signal increases were noted in the supplementary eye fields (SEF) and left inferior parietal lobule (IPL).
Conclusions:
- The findings support a semantic basis for the classic identity negative priming (NP) effect.
- The left anterolateral temporal cortex, particularly the temporal pole, is implicated in semantic processing during NP.
- The supplementary eye fields (SEF) and left inferior parietal lobule (IPL) may also contribute to NP mechanisms.
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