Bøger af Werner Reichardt

The objective of this lecture is to describe and to analyze the orientation behavior of flying flies towards different elementary patterns in their optical environment. The investigations presented here so far are confined to one dimension: the angular rotation of the fly around its vertical axes, caused by a flight torque signal which in turn is generated by the two wings. The pattern induced orientation behavior rests mainly on the observation, that elementary parts of the retinae and their associated nerve structures operate independently and lead to asymmetric induced torque responses when an object is symmetrically moved. The observations are in accordance with the hypothesis that spontaneous pattern differentiation by flies is due to a parallel organisation of identical motion perception mechanisms whose computational power rests on a central parametric control. Resume Cette conference a pour objet de decrire et d'analyser Ie comportement d'orientation de mouches en vol vers divers patterns elementaires places dans leur entourage visuel. Les recherches presentees ici sont limitees pour Ie moment a une seule dimension: la rotation angulaire de la mouche autour d'un axe vertical, telle que la provoque Ie couple de rotation en­ gendre par Ie mouvement des deux ailes. Ce comportement d' orientation induit par un pattern repose simplement sur l'observation que des parties elementaires des deux retines et des structures nerveuses qui leur sont associees operent independament et conduisent a des couples induits asymetriques lorsqu'un objet est deplace symetriquement.