Email updates

Keep up to date with the latest news and content from BMC Neuroscience and BioMed Central.

Open Access Highly Accessed Research article

Electrophysiological correlates of object-repetition effects: sLORETA imaging with 64-channel EEG and individual MRI

Myung-Sun Kim1, Kyoung-Mi Jang1, Huije Che2, Do-Won Kim23 and Chang-Hwan Im2*

Author affiliations

1 Department of Psychology, Sungshin Women’s University, Seoul, South Korea

2 Department of Biomedical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea

3 Department of Biomedical Engineering, Yonsei University, Wonju, South Korea

For all author emails, please log on.

Citation and License

BMC Neuroscience 2012, 13:124  doi:10.1186/1471-2202-13-124

Published: 17 October 2012

Abstract

Background

We investigated the electrophysiological correlates of object-repetition effects using an object categorization task, standardized low-resolution electromagnetic tomography (sLORETA), and individual magnetic resonance imaging. Sixteen healthy adults participated, and a total of 396 line drawings of living and non-living objects were used as stimuli. Of these stimuli, 274 were presented only once, and 122 were repeated after one to five intervening pictures. Participants were asked to categorize the objects as living or non-living things by pressing one of two buttons.

Results

The old/new effect (i.e., a faster response time and more positive potentials in response to repeated stimuli than to stimuli initially presented) was observed at 350-550 ms post-stimulus. The distributions of cortical sources for the old and new stimuli were very similar at 250-650 ms after stimulus-onset. Activation in the right middle occipital gyrus/cuneus, right fusiform gyrus, left superior temporal gyrus, and right inferior frontal gyrus was significantly reduced in response to old compared with new stimuli at 250-350, 350-450, 450-550, and 550-650 ms after stimulus-onset, respectively. Priming in response time was correlated with the electrophysiological priming at left parietal area and repetition suppression at left superior temporal gyrus in 450-550 ms.

Conclusions

These results suggest processing of repeated objects is facilitated by sharpening perceptual representation and by efficient detection or attentional control of repeated objects.

Keywords:
Left superior temporal gyrus; Object categorization task; Object-repetition priming; Old/new effect; sLORETA