A millipede compound eye mediating low-resolution vision
| Autor: | Dan-E Nilsson, John D. Kirwan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Difference of Gaussians
genetic structures Computer science Visual Acuity Vision Low Stimulus (physiology) 050105 experimental psychology 03 medical and health sciences 0302 clinical medicine Orientation Animals 0501 psychology and cognitive sciences Computer vision Arthropods Image resolution biology business.industry Low resolution 05 social sciences Millipede Compound eye biology.organism_classification 3d anatomy Sensory Systems Ophthalmology Cylindroiulus punctatus Models Animal Artificial intelligence business Photic Stimulation 030217 neurology & neurosurgery |
| Zdroj: | Vision Research. 165:36-44 |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/j.visres.2019.09.003 |
| Popis: | Millipedes are a species-rich and ancient arthropod clade which typically bear a pair of lateral compound eyes with a small number of large facets. To understand the visual tasks that underlie the evolution of millipede eyes, their spatial resolving performance is of key importance. We here investigate the spatial resolution of the millipede Cylindroiulus punctatus using behavioural assays. Individual animals were placed in the centre of a cylindrical arena under bright downwelling light, with dark stimuli of varying angular dimensions placed on the arena wall. We used continuous isoluminant stimuli based on a difference of Gaussians signal to test for orientation to the dark target via object taxis. Headings of individual animals were tracked in relation to the stimuli to determine whether the animals oriented towards the stimulus. We implemented a multilevel logistic regression model to identify the arc width of the stimulus that animals could resolve. We then modelled the angular sensitivity needed to identify this. We also related the visual performance to the 3D anatomy of the eye. We found that C. punctatus can resolve a stimulus of 56° period (sufficient to detect a 20° dark target). Assuming a contrast threshold of 10%, this requires a receptor acceptance angle of 72° or narrower. Spatial resolving power this low would only suffice for the simplest visual tasks, such as shelter-seeking. |
| Databáze: | OpenAIRE |
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