Topography of acoustic response characteris-tics of the midbrain inferior colliculus (IC) of the Kunming mouse was studied by using extracellular recording tech-niques. The characteristic frequency (CF) range represen...Topography of acoustic response characteris-tics of the midbrain inferior colliculus (IC) of the Kunming mouse was studied by using extracellular recording tech-niques. The characteristic frequency (CF) range represented in the different divisions of the IC differed markedly: 4—15 kHz in the dorsal cortex (DC), 10—70 kHz in the centralnucleus (CN), and 4—35 kHz in the external cortex (EC).The CF in the CN increased from dorsal and lateral to ven-tral and medial, higher CFs represented at its ventromedial part and lower CFs at its dorsal part. The isofrequency con-tours of CFs were incurvate. Minimum thresholds (MT) ofthe auditory neurons in DC and the central part of CN were lower (about 10 dB SPL), but considerably higher in thedorsal and ventral region of EC. Results suggest that each of the divisions in the mouse IC may have different auditory functions.展开更多
基金This work was supported by the National Natural Science Foundation of China (Grant Nos. 30170250 and 39770209).
文摘Topography of acoustic response characteris-tics of the midbrain inferior colliculus (IC) of the Kunming mouse was studied by using extracellular recording tech-niques. The characteristic frequency (CF) range represented in the different divisions of the IC differed markedly: 4—15 kHz in the dorsal cortex (DC), 10—70 kHz in the centralnucleus (CN), and 4—35 kHz in the external cortex (EC).The CF in the CN increased from dorsal and lateral to ven-tral and medial, higher CFs represented at its ventromedial part and lower CFs at its dorsal part. The isofrequency con-tours of CFs were incurvate. Minimum thresholds (MT) ofthe auditory neurons in DC and the central part of CN were lower (about 10 dB SPL), but considerably higher in thedorsal and ventral region of EC. Results suggest that each of the divisions in the mouse IC may have different auditory functions.
