Osorio D, Srinivasan M V, Pinter R B
Centre for Visual Sciences, Australian National University.
J Exp Biol. 1990 Mar;149:281-92. doi: 10.1242/jeb.149.1.281.
The orientation of freely walking flies (female Lucilia cuprina) to lines and stripes in a circular arena is described. The following observations were made. 1. The flies walked straight towards a dark line using the frontal eye region, but a pale line on a dark background was only weakly attractive. 2. In bright conditions flies walked in a curved line towards a black-white edge, the path being convex towards the dark side of the border. The curves indicated that the flies were heading for a point about 5-10 degrees to the dark side of the edge. 3. In dim conditions the edge of a dark region was not especially attractive and flies headed towards any point in the dark area. These observations can be accounted for by assuming that the fly walks towards the darkest region in its visual field (scototaxis). In bright conditions the edges of a dark region become more attractive than its centre. This change could be explained if lateral inhibition creates a 'Mach-band' effect, making the edges appear darker than the centre. Thus, fixation behaviour in walking Lucilia females seems to be a simple taxis.
描述了自由行走的苍蝇（雌性铜绿蝇）在圆形场地中对线条和条纹的定向。有以下观察结果：1. 苍蝇利用额眼区域朝着暗线直线行走，但暗背景上的亮线吸引力较弱。2. 在明亮条件下，苍蝇朝着黑白边缘沿曲线行走，路径向边界的暗侧凸出。这些曲线表明苍蝇正朝着边缘暗侧约5至10度的点前进。3. 在昏暗条件下，暗区域的边缘并非特别有吸引力，苍蝇朝着暗区域内的任何点前进。这些观察结果可以通过假设苍蝇朝着其视野中最暗的区域行走（趋暗性）来解释。在明亮条件下，暗区域的边缘比其中心更具吸引力。如果侧抑制产生“马赫带”效应，使边缘看起来比中心更暗，那么这种变化就可以得到解释。因此，行走的铜绿蝇雌性的固定行为似乎是一种简单的趋性。
