Impaired auditory evoked potentials and oscillations in frontal and auditory cortex of a schizophrenia mouse model

Abstract

Objectives: In patients with schizophrenia, γ-band (30–70 Hz) auditory steady-state electroencephalogram responses (ASSR) are reduced in power and phase locking. Here, we examined whether γ-ASSR deficits are also present in a mouse model of schizophrenia, whose behavioural changes have shown schizophrenia-like endophenotypes. Methods: Electroencephalogram in frontal cortex and local field potential in primary auditory cortex were recorded in phospholipase C β1 (PLC-β1) null mice during auditory binaural click trains at different rates (20–50 Hz), and compared with wild-type littermates. Results: In mutant mice, the ASSR power was reduced at all tested rates. The phase locking in frontal cortex was reduced in the β band (20 Hz) but not in the γ band, whereas the phase locking in auditory cortex was reduced in the γ band. The cortico-cortical connectivity between frontal and auditory cortex was significantly reduced in mutant mice. Conclusions: The tested mouse model of schizophrenia showed impaired electrophysiological responses to auditory steady state stimulation, suggesting that it could be useful for preclinical studies of schizophrenia”.

Key words:

• Schizophrenia
• mouse
• auditory-steady-state-response
• EEG
• oscillations

Acknowledgments

This work was supported by Global Frontier R&D Programme to J. H. Choi by NRF-M1AXA003-2011-0031525, National Science Foundation to D. Krusienski & Y. Shahriari by NSF-1064912 & NSF-1421948, KIST Flagship grant to Y.S. Dadi by 2E25472, and Institute of Basic Science grant to H.-S. Shin by IBS-R001-D1.

Statement of interest

None to declare.