LINEAR AND NONLINEAR PERFORMANCE OF TRANSDUCER AND PUPIL IN CALLIPHORA RETINULA CELLS
LINEAR AND NONLINEAR PERFORMANCE OF TRANSDUCER AND PUPIL IN CALLIPHORA RETINULA CELLS
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DOI：
10.1113/jphysiol.1975.sp010893
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发表时间：
1975-01-01
影响因子：
5.5
通讯作者：
LEUTSCHERHAZELHOFF, JT
中科院分区：
文献类型：
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作者：
LEUTSCHERHAZELHOFF, JT
1.细胞内记录已从丽蝇（丽蝇红头）小网膜细胞;除了传感器机制，这些细胞还具有瞳孔机制。2.在几个平均强度水平下，在明显的线性响应范围内，已经获得了振幅和相位的频率特性以及对“δ”闪光和“δ”闪光对的响应。3.傅立叶方法表明这些响应是相互兼容的，证实了在这些情况下的线性。4.当调制深度增加时，可以使非线性行为出现在较低频率处。5.非线性也可以通过叠加测试的应用出现：低频正弦波，调制以引起明显的线性响应，高频正弦波，即使在最高调制深度也不会引起非线性，当叠加时，当位于前者的最小值时比在其最大值时对后者产生更大的响应。6.在高于约1 Hz的频率下，这些叠加非线性归因于换能器机构增益控制。在这个频率以下，瞳孔机制在小网膜细胞的总增益控制中起着相当大的作用：它的特性仍然有待澄清。7.该传感器的线性和非线性特性与Fuortes-Hodgkin模型的线性和非线性特性密切相关，该模型耦合了增益和时间常数的增加。8. Fuortes-Hodgkin模型可能需要在最初处理的鲎案例中进行一些定量修改，因为它的瞳孔。9.最后，简要指出了Veringa扩散模型的优点，以及最终将该模型与Fuortes-Hodgkin模型结合的可能性。
1. Intracellular recordings have been made from the blowfly (Calliphora erythrocephala) retinula cell; apart from the transducer mechanism, these cells also feature a pupil mechanism. 2. At several mean intensity levels, within the apparently linear range of response, frequency characteristics of amplitude and phase and responses to ‘delta’‐flashes and ‘delta’‐flash pairs have been obtained. 3. Fourier methods have shown these responses to be mutually compatible, confirming linearity in these circumstances. 4. Non‐linear behaviour can be made to appear at the lower frequencies when the modulation depth is increased. 5. Non‐linearities can also appear through application of the superposition test: a low frequency sine wave, modulated so as to elicit an apparently linear response, and a high frequence sine wave which does not give rise to non‐linearity even at the highest modulation depths can, when superimposed, yield a greater response to the latter when situated at the minima of the former than at its maxima. 6. At frequencies above approximately 1 Hz these superposition non‐linearities are attributed to the transducer mechanism gain control. Below this frequency the pupil mechanism takes part considerably in the retinula cell's total observed gain control: its characteristics remain yet to be cleared up. 7. The transducer's linear and non‐linear properties fit in closely with those of the Fuortes‐Hodgkin model which couples increases in gain and time constants. 8. The Fuortes‐Hodgkin model will probably require some quantitative modifications in the originally treated case of Limulus, on account of its pupil. 9. Finally, the merits of Veringa's diffusion model, and the possibility of eventually joining this model with the Fuortes‐Hodgkin one are pointed out briefly.