Figure 1
From: Speed tuning properties of mirror symmetry detection mechanisms
A schematic representation of stimuli used in Experiment 1 (a–c) and Experiment 2 (d,e). The length of the green and red arrows indicates the speed of symmetrical and noise dots, respectively. (a) Speed condition in which symmetric and noise dots drift with either the same (a) or different (d) speeds. (b) Dynamic flicker condition in which elements had a limited lifetime and were relocated to multiple, random successive locations, without any coherent motion. Blue and yellow circles connected by dashed lines represent hypothetical, successive locations of a single pair of dots when relocating over time to different locations (dashed lines are for illustration only, there was no motion trajectory present in the stimulus). (c) Static condition in which a single, static pattern was presented for the entire stimulus duration. (d,e) In Experiment 2, all stimuli contain 50% position symmetry and there were two conditions: (d) a segregated condition in which symmetric dots drift in symmetric, but random directions at one speed and noise dots drift at another speed, and (e) non-segregated condition, in which half of the symmetric pairs and noise dots moved at one speed and the other half of symmetric and noise dots moved at another.
