Microsaccadic sampling of moving image information provides Drosophila hyperacute vision

Microsaccadic sampling of moving image information provides Drosophila hyperacute vision
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运动图像信息的微扫视采样提供果蝇超敏锐视觉

DOI:
10.1101/083691
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发表时间:
2016
期刊:
--
影响因子:
--
通讯作者:
Juusola M
Juusola M
中科院分区:
--
文献类型:
--
作者:
Juusola M

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Small fly eyes should not see fine image details. Because flies exhibit saccadic visual behaviors and their compound eyes have relatively few ommatidia (sampling points), their photoreceptors would be expected to generate blurry and coarse retinal images of the world. Here we demonstrate thatDrosophilasee the world far better than predicted from the classic theories. By using electrophysiological, optical and behavioral assays, we found that R1-R6 photoreceptors’ encoding capacityin timeis maximized to fast high-contrast bursts, which resemble their light input during saccadic behaviors. Whilstover space, R1-R6s resolve moving objects at saccadic speeds beyond the predicted motion-blur-limit. Our results show how refractory phototransduction and rapid photomechanical photoreceptor contractions jointly sharpen retinal images of moving objectsin space-time, enabling hyperacute vision, and explain how such microsaccadic information sampling exceeds the compound eyes’ optical limits. These discoveries elucidate how acuity depends upon photoreceptor function and eye movements.
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