Motion after-effects induced by dynamic illumination in crab vision

Motion detection is an elementary aspect of most animal visual systems. However, many environments are prone to background motion which might disrupt the ability of visual systems to detect relevant motion cues. While in humans, background motion can disrupt the detection of visual cues even after the moving background component has ceased, it remains unknown whether natural forms of background motion might also affect other animal visual systems. Here, we test whether prior exposure to naturally occurring ‘caustics’, a form of dynamically moving light patterns commonly found in shallow aquatic environments, can have a persisting effect on an animal’s motion detection abilities even after the caustic exposure has stopped. To do this, we established the response probability of the shore crab Carcinus maenas to computer-generated expanding disc stimuli mimicking an approaching predator after exposure to either static or moving caustic scenes. Prior exposure to moving caustics had a short-..., , , # Motion after-effects induced by dynamic illumination in crab vision

[https://doi.org/10.5061/dryad.280gb5n17](https://doi.org/10.5061/dryad.280gb5n17)

## Description of the data and file structure

The two datasets contain the binary response (0 = no response, 1 = responded) of the shore crab Carcinus maenas for approaching predator-like expanding disc stimuli on either static or moving caustic backgrounds. 

### Files and variables

#### File: Data\_Experiment1.csv

**Description:** 

##### Variables

* Trial: Trial number
* CrabID: Individual ID for crabs used in this experiment
* Size_mm: A individual crab's carapace width in mm
* Segment: Each trial comprised the presentation of 8 different treatment (see below). Segment refers to the order number of a treatment within a trial.
* Treatment: In total, there were eight treatments, with variations of static or moving caustics in both the exposure and stimulus periods, as well as the contrast (‘visible’ or ‘invisible’) of the expand...,