在以往對(duì)于視覺(jué)系統(tǒng)的研究中，物體的顏色和運(yùn)動(dòng)狀態(tài)被認(rèn)為是通過(guò)不同的神經(jīng)通路來(lái)傳播的,，但是這些來(lái)自不同通路信息是如何整合在一起,，使大腦接收到完整信息至今還是個(gè)謎,。比如在果蠅中，很長(zhǎng)時(shí)間以來(lái)人們都認(rèn)為只有一種吸收光譜的感光細(xì)胞R1-R6是專門(mén)感受物體運(yùn)動(dòng)的,，而R7和R8,，有多種吸收光譜，能夠感受物體的顏色,。
在本文中,，研究者發(fā)現(xiàn)，R7和R8也能夠感受物體的運(yùn)動(dòng),。通過(guò)電生理實(shí)驗(yàn),、光學(xué)實(shí)驗(yàn)和行為學(xué)實(shí)驗(yàn)，研究者發(fā)現(xiàn),，R7和R8感光受體接收到的信號(hào)匯聚在負(fù)責(zé)運(yùn)動(dòng)的通路,，并形成輸出。這一現(xiàn)象說(shuō)明,，通過(guò)對(duì)不同類型的感光細(xì)胞接收的多重信息加以整合,，果蠅才得以擁有良好的視動(dòng)反應(yīng)。研究人員指出,，通過(guò)多光譜的感光受體接收信號(hào)可以增加對(duì)于物體運(yùn)動(dòng)辨別能力,，從而提高觀察力。（生物谷 Bioon.com ）
doi:10.1126/science.1215317
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Multiple Spectral Inputs Improve Motion Discrimination in the Drosophila Visual System
Trevor J. Wardill1, Olivier List1, Xiaofeng Li, Sidhartha Dongre, Marie McCulloch, Chun-Yuan Ting, Cahir J. O’Kane, Shiming Tang, Chi-Hon Lee, Roger C. Hardie, Mikko Juusola.
Color and motion information are thought to be channeled through separate neural pathways, but it remains unclear whether and how these pathways interact to improve motion perception. In insects, such as Drosophila, it has long been believed that motion information is fed exclusively by one spectral class of photoreceptor, so-called R1 to R6 cells; whereas R7 and R8 photoreceptors, which exist in multiple spectral classes, subserve color vision. Here, we report that R7 and R8 also contribute to the motion pathway. By using electrophysiological, optical, and behavioral assays, we found that R7/R8 information converge with and shape the motion pathway output, explaining flies’ broadly tuned optomotor behavior by its composite responses. Our results demonstrate that inputs from photoreceptors of different spectral sensitivities improve motion discrimination, increasing robustness of perception.
