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These materials form the basis of the work for the paper [Is it just motion that silences awareness of other visual changes?][1] freely available at Journal of Vision. You can download full PsychoPy code to run this study in the Experiment Code section below. In the Analysis and Raw Data sections you can find the raw files needed to reproduce full the plots, as used in the manuscript, from the raw data files. ## Is it just motion that silences awareness of other visual changes? ## *Jonathan Peirce, Nottingham Visual Neuroscience, University of Nottingham* **Abstract** When an array of visual elements is changing colour, size or shape incoherently the changes are typically quite visible even when the overall colour, size or shape statistics of the field may not have changed. When the dots also move, however, the changes become much less apparent; awareness of them is ‘silenced’ (Suchow and Alvarez, 2011). This finding might indicate that the perception of motion is of particular importance to the visual system, such that it is given priority in processing over other forms of visual change. Here we examine whether that is the case by examining the converse case; whether awareness of motion signals can be silenced by potent coherent changes in colour or size. We find that they can, and with very similar effects, indicating that motion is not critical for silencing. Suchow and Alvarez’s dots always moved in the same direction with the same speed, causing them to be ‘grouped’ as a single entity. We also tested whether this coherence was a necessary component of the silencing effect. It is not; when the dot speeds are randomly selected, such that no coherent motion is present, the silencing effect remains. It is clear that neither motion nor grouping is directly responsible for the silencing effect. Silencing can be generated from any potent visual change. [1]:
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