Origins of the N145 component elicited by checker board pattern-reversal stimulations.
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1
Okayama University of Science, Japan
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2
Okayama Ryogo Center, Japan
This magnetoencephalography study investigated the difference in visual information processing between checkerboard pattern-reversal (PR) stimulations with and without color modulations. Visual stimulations consisted of the standard 1 Hz transient 10 x 10 checkerboard PR (green-black vs. black-green), and a 1 Hz checkerboard PR with color modulations (green-black vs. black-red). The brightness of the green and the red check was adjusted to 25 cd/m2, with a contrast of 100%. Left or right half visual field stimulations were made monocular to the right eye of eight normal subjects. Visual evoked magnetic fields were measured with a 148 channel magnetometer in a darkened magnetically shielded room. The evoked magnetic fields showed the similar triphasic N75-P100-N145 peaks for both types of stimulation. Ratio of the N145/P100 peak amplitudes, however, increased significantly (1.10 to 1.77 for left half visual field and 0.65 to 0.90 for right half visual field stimulations) with color modulations. Source analysis with multi dipole model identified two different sources for the N145 peak: a stronger component originating in the striate cortex (V1) similar to the P100 peak, and a weaker component originating in the ventral extrastriate cortex (V4) which peaked at about 10 ms before the conventional N145 peak [1]. We suggest N145 is generated through wave-length sensitive ventral pathway (P pathway), with simultaneous activations first in V4 at about 135 ms and then in V1 at about 145 ms.
References
1. Hatanaka K, Nakasato N, Kanno A, Ohtomo S, Yoshimoto T. (2002) Source localizations of visual evoked magnetic fields using the conventional dipole model and minimum current estimates. Proc. BIOMAG 2002.:463-465.
Conference:
Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010.
Presentation Type:
Poster Presentation
Topic:
Sensory Processing and Functional Connectivity
Citation:
Hatanaka
K,
Sakamoto
M,
Ishitomi
Y,
Kutsuna
Y and
Yoshida
H
(2010). Origins of the N145 component elicited by checker board pattern-reversal stimulations..
Front. Neurosci.
Conference Abstract:
Biomag 2010 - 17th International Conference on Biomagnetism .
doi: 10.3389/conf.fnins.2010.06.00185
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Received:
29 Mar 2010;
Published Online:
29 Mar 2010.
*
Correspondence:
Keisaku Hatanaka, Okayama University of Science, Okayama, Japan, hatanaka@dap.ous.ac.jp