کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
926452 | 921868 | 2013 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Two dimensions of visibility revealed by multidimensional scaling of metacontrast Two dimensions of visibility revealed by multidimensional scaling of metacontrast](/preview/png/926452.png)
An increasing number of studies use subjective reports of visibility, so as to delineate the domain of perceptual awareness. It is generally assumed that degrees of visibility can be ordered on a single unidimensional scale. Here, I put this assumption to test with metacontrast, one of the most studied visual masking paradigms. By means of multidimensional scaling, I show that even though metacontrast stimuli only differ along the dimension of time, the perceptual space they generate unfolds in three dimensions: time and two kinds of visibilities, that are confounded when projected onto a unitary visibility scale. I argue that metacontrast creates multidimensional complex percepts, a property that may run counter to its use as a simple modulator of visibility. More broadly the results cast doubt on the use of visibility scales that ignore the qualities of the percepts.
► The perceptual space of metacontrast is tridimensional.
► Duration is the main perceptual dimension.
► Visibility is two-tiered.
► Short durations metacontrast stimuli yield integrated percepts.
► Long durations metacontrast stimuli yield segregated percepts.
Journal: Cognition - Volume 126, Issue 2, February 2013, Pages 173–180