Receptive field plasticity of neurons in rat auditory cortex

Using conventional electrophysiological technique, we investigated the plasticity of the frequency receptive fields (RF) of auditory cortex (AC) neurons in rats. In the AC, when the frequency difference between conditioning stimulus frequency (CSF) and the best frequency (BF) was in the range of 1--4 kHz, the frequency RF of AC neurons shifted. The smaller the differences between CSF and BF, the higher the probability of the RF shift and the greater the degree of the RF shift. To some extent, the plasticity of RF was dependent on the duration of the session of conditioning stimulus (CS). When the frequency difference between CSF and BF was bigger, the duration of the CS session needed to induce the plasticity was longer. The recovery time course of the frequency RF showed opposite changes after CS cessation.The RF shift could be induced by the frequency that was either higher or lower than the control BF, demonstrating no clear directional preference. The frequency RF of some neurons showed bidirectional shift, and the RF of other neurons showed single directional shift. The results suggest that the frequency RF plasticity of AC neurons could be considered asan ideal model for studying plasticity mechanism. The present study also provides important evidence for further study of learning and memory in auditory system.     

《大希疵阿斯篇》解读

美是什么?美不是漂亮的小姐、黄金等具体的美的事物,也不是恰当、有用、有益,也不是由视觉和听觉产生的快感,这些答案都经不起事实的检验和逻辑的推敲,"美是难的".     

Topography of acoustic response characteristics in the midbrain inferior colliculus of Kunming mouse

Topography of acoustic response characteristics of the midbrain inferior colliculus(IC)of the Kunming mouse was studied by using extracellular recording techniques.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 central nucleus(CN),and 4-35kHz in the external cortex(EC).The CF in the CN increased from dorsal and lateral to ventral and medial,higher CFs represented at its ventromedial part and lower CFs at its dorsal part.The isofrequency contours of CFs were incurvate.Minimum thresholds(MT)of the auditory neurons in DC and the central part of CN were lower(about 10dB SPL),but considerably higher in the dorsal and ventral region of EC.Results suggest that each of the divisions in the mouse IC may have different auditory functions.     

浅析表象训练在武术跳跃动作训练中的应用

表象训练法是近年来各国教练员和运动员采用的一种心理训练方法,它对于运动员掌握高难度的技术动作有着非常重要的作用;本文通过实验进行对比,结果表明表象训练对武术中的跳跃动作的训练有着良好的效果,这对于提高武术跳跃动作训练质量有着极其重要的作有。     

有关钢琴演奏音色的探讨

音乐是听觉的艺术,音色是音的色彩。在钢琴演奏中如何通过音色变化,使人产生各种不同的有关声音的联想,并获得美的感受,一直是我们孜孜以求的目标。本文通过对听觉变化,内心听觉,分析作品的阐释,说明音色在钢琴演奏中的重要性。     

螽斯声管系统对方向听觉的影响

在动物声通信过程中,方向听觉具有特别重要的作用。对于接收声信号的动物来说,有三项任务必须完成:第一,它要判别发声的动物是属于同种、异种,还是它的“天敌”;第二,要辨识声信号的含义;第三,要测知发声动物的空间方位,从而决定采取何种应答或行动:趋声或逃避。作者曾对同地共生的两种螽斯——短翅鸣螽与硕螽的趋声行为进行过定量分析。实     

近代物理学中力的概念

阐述了力的概念的发展，从近代物理高度审视力的概念并给出力的新定义。     

一个开启有声世界大门的人--访复旦大学医学院耳鼻喉研究所所长王正敏教授

人像埃奥利亚的竖琴,外来的和内在的印象掠过他,尤如一阵阵不断变化的风吹动琴弦,弹出灿烂辉煌的人生之歌.然而,人的思想交流却70%是要靠听到语言,失去了听觉,人将生活在寂静、孤独的世界,千百年来,多少医学家都在探索--听觉是什么?     

喋血宫门 势不可免

玄武门之变是中国古代一次著名的宫庭政变。本文拟通过探讨玄武门之变的原委，以期揭示掩盖在此类宫变表象下一些带有规律性的东西。