Now showing items 1-4 of 4

    • Biophysics of object segmentation in a collision-detecting neuron 

      Dewell, Richard Burkett; Gabbiani, Fabrizio (2018)
      Adaptive collision avoidance behaviours require accurate detection of complex spatiotemporal properties of an object approaching in an animal's natural, three-dimensional environment. Within the locust, the lobula giant movement detector and its postsynaptic partner, the descending contralateral movement detector (DCMD), respond robustly to images ...
    • Biophysics of object segmentation in a collision-detecting neuron 

      Dewell, Richard Burkett; Gabbiani, Fabrizio (2018)
      Collision avoidance is critical for survival, including in humans, and many species possess visual neurons exquisitely sensitive to objects approaching on a collision course. Here, we demonstrate that a collision-detecting neuron can detect the spatial coherence of a simulated impending object, thereby carrying out a computation akin to object ...
    • Feedforward Inhibition Conveys Time-Varying Stimulus Information in a Collision Detection Circuit 

      Wang, Hongxia; Dewell, Richard B.; Zhu, Ying; Gabbiani, Fabrizio (2018)
      Feedforward inhibition is ubiquitous as a motif in the organization of neuronal circuits. During sensory information processing, it is traditionally thought to sharpen the responses and temporal tuning of feedforward excitation onto principal neurons. As it often exhibits complex time-varying activation properties, feedforward inhibition could also ...
    • Pre-synaptic Muscarinic Excitation Enhances the Discrimination of Looming Stimuli in a Collision-Detection Neuron 

      Zhu, Ying; Dewell, Richard B.; Wang, Hongxia; Gabbiani, Fabrizio (2018)
      Visual neurons that track objects on a collision course are often finely tuned to their target stimuli because this is critical for survival. The presynaptic neural networks converging on these neurons and their role in tuning them remain poorly understood. We took advantage of well-known characteristics of one such neuron in the grasshopper visual ...