Roland Hengstenberg

Learn More
The third visual neuropil (lobula plate) of the blowfly Calliphora erythrocephala is a center for processing motion information. It contains, among others, 10 individually identifiable "vertical system" (VS) neurons responding to visual wide-field motions of arbitrary patterns. We demonstrate that each VS neuron is tuned to sense a particular aspect of(More)
Integrating binocular motion information tunes wide-field direction-selective neurons in the fly optic lobe to respond preferentially to specific optic flow fields. This is shown by measuring the local preferred directions (LPDs) and local motion sensitivities (LMSs) at many positions within the receptive fields of three types of anatomically identifiable(More)
We quantitatively analysed compensatory head reactions of flies to imposed body rotations in yaw, pitch and roll and characterized the haltere as a sense organ for maintaining equilibrium. During constant velocity rotation, the head first moves to compensate retinal slip and then attains a plateau excursion (Fig. 3). Below 500°/s, initial head velocity as(More)
1. The common response properties to simple visual stimuli (light impulses, light steps, and movement of simple patterns at different speeds) has been investigated by intracellular recording from Giant Vertical Cells (VS) in the lobula plate of the blowflyCalliphora erythrocephala. 2. The impulse response begins < 10ms after onset of the photoreceptor(More)
Humans, animals and some mobile robots use visual motion cues for object detection and navigation in structured surroundings. Motion is commonly sensed by large arrays of small field movement detectors, each preferring motion in a particular direction. Self-motion generates distinct 'optic flow fields' in the eyes that depend on the type and direction of(More)
1. The structure of one class of giant tangential neurons in the lobula plate ofCalliphora, the ‘Vertical System (VS)’ has been investigated by light microscopy. Different staining and reconstruction procedures were employed to ensure that all existing VS-neurons are revealed. 2. There are 11 VS-cells in a characteristic, and constant arrangement (Fig. 2).(More)
1. In the blowflyCalliphora flying stationarily in a wind tunnel, compensatory head movements were elicited by rolling the fly about its longitudinal axis (Fig. 1). Responses were recorded on video tape, and evaluated by single frame analysis. 2. Active head movements were observed in response to visual and mechanosensory stimuli (Fig. 2). They are not made(More)
OUR understanding of information processing in nerve nets has been modified by the concept of graded signal transmission'. Descriptions of non-spiking interneurones in insects 2-8 , and the demonstration of graded synaptic transmission 3 have contributed to this development. In the fly visual nervous system, second and higher order interneurones are known,(More)
The 3 ocelli of the blowfly Calliphora erythrocephala, grouped close together on the top of the head (Fig. 1), have large, extensively overlapping visual fields. Together they view the entire upper hemisphere of the surroundings plus part of the lower hemisphere (Figs. 5, 7). It is shown for the lateral ocelli that despite the underfocussing of the ocellar(More)