ArticleThe Journal of neuroscience : the official journal of the Society for Neuroscience2012
Logarithmic compression of sensory signals within the dendritic tree of a collision-sensitive neuron.
Article in The Journal of neuroscience : the official journal of the Society for Neuroscience, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed.
- A spiking neural network model for fractional proprioceptive encoding of limb posture and movement in insects.Biological cybernetics · 2026Article
- Responses of a locust visual interneuron correlate with simple and compound object motion within the vertical plane.The Journal of experimental biology · 2025Article
- Convergent escape behaviour from distinct visual processing of impending collision in fish and grasshoppers.The Journal of physiology · 2023Article
- Contrast polarity-specific mapping improves efficiency of neuronal computation for collision detection.eLife · 2022Article
- A model of feedforward, global, and lateral inhibition in the locust visual system predicts responses to looming stimuli.Biological cybernetics · 2021Article
- Feedforward Inhibition Conveys Time-Varying Stimulus Information in a Collision Detection Circuit.Current biology : CB · 2018Article
- Characterization and modelling of looming-sensitive neurons in the crab Neohelice.Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology · 2018Article
- Article
- Scaling Our World View: How Monoamines Can Put Context Into Brain Circuitry.Frontiers in cellular neuroscience · 2018Article
- Two identified looming detectors in the locust: ubiquitous lateral connections among their inputs contribute to selective responses to looming objects.Scientific reports · 2016Article
- Fine and distributed subcellular retinotopy of excitatory inputs to the dendritic tree of a collision-detecting neuron.Journal of neurophysiology · 2016Article
- Dendritic Pooling of Noisy Threshold Processes Can Explain Many Properties of a Collision-Sensitive Visual Neuron.PLoS computational biology · 2015Article
- A Computational Model of a Descending Mechanosensory Pathway Involved in Active Tactile Sensing.PLoS computational biology · 2015Article
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2 authors.
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Abstract
Neurons in a variety of species, both vertebrate and invertebrate, encode the kinematics of objects approaching on a collision course through a time-varying firing rate profile that initially increases, then peaks, and eventually decays as collision becomes imminent. In this temporal profile, the peak firing rate signals when the approaching object's subtended size reaches an angular threshold, an event which has been related to the timing of escape behaviors. In a locust neuron called the lobula giant motion detector (LGMD), the biophysical basis of this angular threshold computation relies on a multiplicative combination of the object's angular size and speed, achieved through a logarithmic-exponential transform. To understand how this transform is implemented, we modeled the encoding of angular velocity along the pathway leading to the LGMD based on the experimentally determined activation pattern of its presynaptic neurons. These simulations show that the logarithmic transform of angular speed occurs between the synaptic conductances activated by the approaching object onto the LGMD's dendritic tree and its membrane potential at the spike initiation zone. Thus, we demonstrate an example of how a single neuron's dendritic tree implements a mathematical step in a neural computation important for natural behavior.
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