title: Anisotropic spatial coherence of ongoing and spontaneous activities in auditory cortex.
abstract: We carried out voltage-sensitive dye imaging of the guinea pig auditory cortex to determine whether the ongoing and spontaneous activities of the cortex exhibit spatial coherence reflecting the tonotopic organization of the cortex. We used independent component analysis and a signal-plus-noise model to extract ongoing activities from the observed signals including physiological noise and stimulus-evoked activities. We analyzed the cross-correlations of background activities between all pairs of recording channels and found that ongoing and spontaneous activities in the auditory cortex exhibited anisotropic spatial coherence extending along the isofrequency bands.
authors.affiliation: Department of Physical Electronics, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan.
authors.forename: Takamasa
authors.initials: T
authors.lastname: Yoshida
authors.forename: Masanori
authors.initials: M
authors.lastname: Sakagami
authors.forename: Takusige
authors.initials: T
authors.lastname: Katura
authors.forename: Kyoko
authors.initials: K
authors.lastname: Yamazaki
authors.forename: Shigeru
authors.initials: S
authors.lastname: Tanaka
authors.forename: Mitsumasa
authors.initials: M
authors.lastname: Iwamoto
authors.forename: Naoki
authors.initials: N
authors.lastname: Tanaka
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D016880:Anisotropy; D001303:Auditory Cortex / Q000502:physiology*; D001931:Brain Mapping; D004396:Coloring Agents; D006168:Guinea Pigs; D007091:Image Processing, Computer-Assisted; D008297:Male; D025341:Principal Component Analysis; D041623:Tomography, Optical Coherence
chemical_list: D004396:Coloring Agents