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Foveal evoked magneto-encephalography features related to the parvocellular pathway

Published online by Cambridge University Press:  28 April 2008

CHIA-YEN YANG ,
JEN-CHUEN HSIEH  and
YIN CHANG
CHIA-YEN YANG
Affiliation:
Institute of Biomedical Engineering, National Yang-Ming University, Taipei, Taiwan, Republic of China
JEN-CHUEN HSIEH
Affiliation:
Institute of Health Informatics and Decision Making, School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China Institute of Neuroscience, School of Life Science, National Yang-Ming University, Taipei, Taiwan, Republic of China Faculty of Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China Laboratory of Integrated Brain Research, Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China
YIN CHANG*
Affiliation:
Institute of Biomedical Engineering, National Yang-Ming University, Taipei, Taiwan, Republic of China
*
Address correspondence and reprint requests to: Yin Chang, Institute of Biomedical Engineering, National Yang-Ming University, 155 Section 2 Li-Nong Street, Shih-Pai, Peitou, Taipei 112, Taiwan, Republic of China. E-mail: ychang@bme.ym.edu.tw
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Abstract

The aim of this study was to use non-invasive magneto-encephalographic techniques, together with visual stimulus paradigms that can psychophysically separate the M- and P-pathways, to examine the physiological relations of the pathways at the fovea with (1) the magneto-encephalography components M70 and M100 (in latency and amplitude), and (2) the cortical oscillatory activities (alpha, beta, and gamma), respectively. The checkerboard stimuli accompanied with different spatial frequencies (SFs) (0.5 or 4 cycles per degree) were presented (within 2° of the retinal center) to six healthy subjects by using steady-pedestal and pulse paradigms, which could activate distinct populations of M- and P-neurons. SF analyzed brain responses in each paradigm. The results show a consistent trend in M70 and M100 with increased latencies and amplitudes in response to the high SF. Mean while, the beta to gamma activities are apparently enhanced by the stimulus of high SF, especially under pulse paradigm (p = 0.03). In this study, we suggest that M70 can be a good clue to characterize the P-pathway. Moreover, in the frequency analysis, the beta oscillations may serve for more detailed visual information, while the gamma oscillations seem to reflect the signal processing in the P-pathway and with sensitivity to the fovea.

Keywords

ParvocellularSpatial frequencyFovea; WaveletMagneto-encephalograph
Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 2 , March 2008 , pp. 179 - 185
Copyright
Copyright © Cambridge University Press 2008

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