Persistence of orientation toward a temporarily invisible landmark in Drosophila melanogaster
Persistence of orientation toward a temporarily invisible landmark in Drosophila melanogaster
复制标题
DOI：
10.1007/s003590050190
复制
发表时间：
1998-04-01
期刊：
影响因子：
--
通讯作者：
Pichler, J
中科院分区：
文献类型：
--
作者：
Strauss, R;Pichler, J
在竞技场的实验中，我们发现了一个显著的持久性的方向走向一个里程碑，消失在苍蝇的方法。通过“后固定”实现的方向稳定性允许苍蝇在自然条件下继续追逐，其中选定的目标经常被周围的结构所隐藏。后注视的持久性进行了研究，在布里丹的范式，其中一只苍蝇持续来回走动之间的两个难以接近的地标。在选定的目标消失后，在约50%的试验中，果蝇保持其预期的路线超过15个约2.5 mm的体长。约13%甚至超过75个体长。大约88%的方法在2.4 s和8.6 s的峰值周围聚集成相等的部分。大约12%的方法持续时间更长。相比之下，在约2.2 s处的单峰足以描述随机游走中取向的持续性。追踪一个看不见的地标的能力既不受这个目标消失时从朝向这个地标的路线的瞬时角度偏离的干扰，也不受分散注意力的第二个地标的干扰。因此，后注视似乎需要一种内在的对隐蔽目标方向的表征，以及保持这一方向的独特的航向控制。
In arena experiments with the walking fruit fly, we found a remarkable persistence of orientation toward a landmark that disappeared during the fly's approach. The directional stability achieved by 'after-fixation' allows a fly to continue pursuit under natural conditions, where a selected target is frequently concealed by surrounding structures. The persistence of after-fixation was investigated in Buridan's paradigm, where a fly walks persistently back and forth between two inaccessible landmarks. Upon disappearance of a selected target, the flies maintained their intended course for more than 15 body lengths of approximately 2.5 mm in about 50% of the trials. About 13% even exceeded 75 body lengths. About 88% of the approaches clustered in equal portions around peaks at 2.4 s and 8.6 s. About 12% of the approaches persisted even longer. In contrast, a single peak at about 2.2 s is sufficient to describe the persistence of orientation in a random walk. The ability to pursue an invisible landmark is disturbed neither by a transient angular deviation from the course toward this landmark, when this target disappeared, nor by a distracting second landmark. Accordingly, after-fixation seems to require an internal representation of the direction toward the concealed target, and idiothetical course control to maintain this direction.