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Similarity in Neuronal Firing Regimes across Mammalian Species
Mochizuki, Yasuhiro,Onaga, Tomokatsu,Shimazaki, Hideaki,Shimokawa, Takeaki,Tsubo, Yasuhiro,Kimura, Rie,Saiki, Akiko,Sakai, Yutaka,Isomura, Yoshikazu,Fujisawa, Shigeyoshi,Shibata, Ken-ichi,Hirai, Daich Society for Neuroscience 2016 The Journal of neuroscience Vol.36 No.21
<P>The architectonic subdivisions of the brain are believed to be functional modules, each processing parts of global functions. Previously, we showed that neurons in different regions operate in different firing regimes in monkeys. It is possible that firing regimes reflect differences in underlying information processing, and consequently the firing regimes in homologous regions across animal species might be similar. We analyzed neuronal spike trains recorded from behaving mice, rats, cats, and monkeys. The firing regularity differed systematically, with differences across regions in one species being greater than the differences in similar areas across species. Neuronal firing was consistently most regular in motor areas, nearly random in visual and prefrontal/medial prefrontal cortical areas, and bursting in the hippocampus in all animals examined. This suggests that firing regularity (or irregularity) plays a key role in neural computation in each functional subdivision, depending on the types of information being carried.</P>
Intraday Variability Feature and Milliarcsecond-Scale Structure in PKS 1622-297
Kiyoaki Wajima,Hayley E. Bignall,Hideyuki Kobayashi,Hisashi Hirabayashi,Kenta Fujisawa,Masato Tsuboi,Philip G. Edwards,Yasuhiro Murata 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
PKS 1622.297 is the most luminous gamma-ray emitting active galactic nucleus (AGN) ever detected and shows a gamma-ray intraday variability (IDV). We made a high-resolution space very long baseline interferometry (VLBI) observation of the source almost three years after the gammaray IDV. The source shows a compact core-jet structure, and all jet components have an apparent superluminal motion up to 12 h.1c. As an alternative probe of the sub-parsec scale structure, we also present the results from multi-epoch Australia Telescope Compact Array (ATCA) total flux monitoring, which indicate the presence of IDV. We examine the inner structure of the gamma-ray emitting AGN in light of these observations.