INFLUENCE OF STIMULATING LATERAL AMYGDALOID NUCLEUS ON THE ACTIVITY AND TUNING CURVE OF ON-OFF RESPONSE NEURON IN THE A I AREA OF THE RAT''''S CORTEX
刺激大鼠杏仁外侧核对皮层AⅠ区ON-OFF神经元反应及调谐曲线的影响

Experiments were performed on 30 SD rats anaesthetized with urethane. The unit discharge of auditory neuron in the cortical A I area was recorded with the extracellularly recording method. The character of ON-OFF responses induced by short pure tone and the influence of stimulating lateral amygdaloid nucleus (LA) on these responses and the tuning curves of the recorded neurons were examined. The experimental results approved that the pattern of the ON-OFF response was related to the intensity, frequency and duration of the pure tone and the LA stimulation could decrease the discharge of ON-OFF neurons in A I area, enhance the threshold of the ON-OFF response or change the modality of the response of these neurons. Furthermore LA stimulation could narrow the turning curve of the ON-OFF neurons and increase its Q10 values. All these indicate that the A I ON-OFF neuron encodes multiple information of the sounds, and the LA can modulate auditory information at the cortex level, thus improve the ability of filtrating frequency information of ON-OFF neurons in A I area and detecting particular auditory information from the surrounding noisy environment.