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A neural model of the optomotor system accounts for ordered responses to decreasing stimulus spatial frequencies

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A. Cartoon of ordering effect indicated by honeybee descending neuron responses. Spatial frequency decreases from blue to green. B. Model diagram showing annealed synapses (coloured, same colours indicate same synaptic conductance). C. Slice of annealing results (Medulla-Lobula conductance of 0.04nS) showing stable region (green / blue area). D. Model response for a high objective function value (left), and the corresponding response for an RHD using the model output up to the Medulla.
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Figure 1: A. Cartoon of ordering effect indicated by honeybee descending neuron responses. Spatial frequency decreases from blue to green. B. Model diagram showing annealed synapses (coloured, same colours indicate same synaptic conductance). C. Slice of annealing results (Medulla-Lobula conductance of 0.04nS) showing stable region (green / blue area). D. Model response for a high objective function value (left), and the corresponding response for an RHD using the model output up to the Medulla.

Mentions: In insects the optomotor response produces a motor action to compensate for unintended body rotation. The response is generally modeled as a Reichardt-Hassenstein (HSD) or Barlow-Levick (BL) correlation detector, as anatomical and physiological studies in Drosophila melanogaster have demonstrated consistent neural pathways and responses in the insect brain [1]. Recordings from the descending neurons carrying the optomotor response signal in honeybees indicate an ordering effect for different stimulus spatial frequencies, with a greater response with decreasing frequency [2] (see Figure 1A), which is not accounted for by HSD or BL correlation detectors.


A neural model of the optomotor system accounts for ordered responses to decreasing stimulus spatial frequencies
A. Cartoon of ordering effect indicated by honeybee descending neuron responses. Spatial frequency decreases from blue to green. B. Model diagram showing annealed synapses (coloured, same colours indicate same synaptic conductance). C. Slice of annealing results (Medulla-Lobula conductance of 0.04nS) showing stable region (green / blue area). D. Model response for a high objective function value (left), and the corresponding response for an RHD using the model output up to the Medulla.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4697642&req=5

Figure 1: A. Cartoon of ordering effect indicated by honeybee descending neuron responses. Spatial frequency decreases from blue to green. B. Model diagram showing annealed synapses (coloured, same colours indicate same synaptic conductance). C. Slice of annealing results (Medulla-Lobula conductance of 0.04nS) showing stable region (green / blue area). D. Model response for a high objective function value (left), and the corresponding response for an RHD using the model output up to the Medulla.
Mentions: In insects the optomotor response produces a motor action to compensate for unintended body rotation. The response is generally modeled as a Reichardt-Hassenstein (HSD) or Barlow-Levick (BL) correlation detector, as anatomical and physiological studies in Drosophila melanogaster have demonstrated consistent neural pathways and responses in the insect brain [1]. Recordings from the descending neurons carrying the optomotor response signal in honeybees indicate an ordering effect for different stimulus spatial frequencies, with a greater response with decreasing frequency [2] (see Figure 1A), which is not accounted for by HSD or BL correlation detectors.

View Article: PubMed Central - HTML

No MeSH data available.