PMID: 9529903Apr 8, 1998Paper

Simultaneous encoding of direction at a local and global scale

Perception & Psychophysics
S N Watamaniuk, S P McKee

Abstract

Human observers can simultaneously encode direction information at two different scales, one local (an individual dot) and one global (the coherent motion of a field of dots distributed over a 10 degrees-diameter display). We assessed whether encoding global motion would preclude the encoding of a local trajectory component and vice versa. In the present experiments, a large number (100-150) of dots were randomly assigned directions in each frame from a uniform distribution of directions spanning a range of 160 degrees to create global motion in a single direction (Williams & Sekuler, 1984). Amidst these background dots, 1 dot moved in a consistent direction (trajectory) for the duration of the display. The direction of this "trajectory dot" was similar to the mean direction of the distribution of directions determining the movement of the background dots. Direction discrimination for both the global motion and the trajectory was measured, using the method of constant stimuli, under precued and postcued partial report conditions. A low- or high-frequency 85-msec tone signaled which motion the subject was to judge. In the precue condition, the tone was presented 200 msec before the onset of the stimulus, whereas in the postcue c...Continue Reading

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Citations

Nov 11, 1999·The Journal of General Psychology·M S Kim, K R Cave
May 26, 2005·Perception & Psychophysics·Sang Chul Chong, Anne Treisman
Jul 13, 2011·Psychonomic Bulletin & Review·Jason Haberman, David Whitney
Jan 1, 2000·Vision Research·H J Rauber, S Treue
Jan 13, 2005·Vision Research·Sang Chul Chong, Anne Treisman
Jan 22, 2003·Vision Research·Scott N J WatamaniukR Eric Stohr
Jul 19, 2005·Vision Research·Fatima M Felisberti, Johannes M Zanker
Aug 2, 2019·Journal of Vision·Sabrina Hansmann-RothÁrni Kristjánsson
Sep 12, 2017·Annual Review of Psychology·David Whitney, Allison Yamanashi Leib
Aug 10, 2018·Attention, Perception & Psychophysics·Anna Xiao Luo, Jiaying Zhao
Nov 11, 2020·Attention, Perception & Psychophysics·Tram T N NguyenIan M Thornton
Nov 27, 2020·Attention, Perception & Psychophysics·Linfeng HanDavid Whitney

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