Article

Visual search for a motion singleton among coherently moving distractors.

Department of Psychology, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany.
Psychological Research (Impact Factor: 2.47). 04/2006; 70(2):103-16. DOI: 10.1007/s00426-004-0194-5
Source: PubMed

ABSTRACT In the current study, we tested whether search for a visual motion singleton presented among several coherently moving distractors can be more efficient than search for a motion stimulus presented with a single distractor. Under a variety of conditions, multiple spatially distributed and coherently moving distractors facilitated search for a uniquely moving target relative to a single-motion-distractor condition (Experiments 1, 3, and 4). Color coherencies among static distractors were not equally effective (Experiments 1 and 2). These results confirm that humans are highly sensitive to antagonistically directed motion signals in backgrounds compared with spatially more confined regions of visual images.

0 Bookmarks
 · 
60 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: We trained seven pigeons to discriminate arrays of 8 identical icons that made small random movements in the same direction (coherent movement) from arrays of 8 identical icons that made small random movements in different directions (incoherent movement), with each icon moving within its own cell in an invisible 4×4 grid. During initial training, one specific configuration of icons (a fixed array) was used. The pigeons learned this discrimination and were later trained with successively introduced novel fixed arrays, and finally with novel arrays of random spatial arrangements (random arrays). Four pigeons successfully learned the final version of the task and were tested with random arrays containing different numbers of icons (from 2 to 12). Discrimination accuracy rose as the number of icons increased. These and other findings suggested that the pigeons had discriminated the visual displays by relying on the relative motion of the icons. Nevertheless, motion signals from individual icons (i.e., absolute motion) did interfere with discriminative performance to arrays of coherently moving icons. These results were considered in light of findings from another experiment in which pigeons had to search for a static icon among identical icons that moved coherently or incoherently as in the present study.
    Behavioural processes 10/2012; · 1.53 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: According to the preemptive-control hypothesis, participants can specify their control settings to attend to relevant target colours or to ignore the irrelevant distractor colours in advance of the displays. Two predictions of this hypothesis were tested. First, with the control settings being specified in advance, capture by a stimulus that better matches the settings was expected to temporally precede capture by a stimulus that matches the setting less well. Second, with the control settings being specified in advance, stronger capture by the better matching than by the less matching stimulus was predicted not to be a stimulus-driven consequence of the target colour in a preceding trial. Both predictions were shown to hold true under different conditions in three experiments.
    Quarterly journal of experimental psychology (2006) 08/2007; 60(7):952-75. · 1.82 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Under some circumstances, moving objects capture attention. Whether a change in the direction of a moving object attracts attention is still unexplored. We investigated this using a continuous tracking task. In Experiment 1, four grating patches changed smoothly and semirandomly in their positions and orientations, and observers attempted to track the orientations of two of them. After the stimuli disappeared, one of the two target gratings was queried and observers reported its orientation; hence direction of the gratings' motion across the screen was an irrelevant feature. Despite the irrelevance of its motion, when the nonqueried grating had collided with an invisible boundary within the last 200 msec of the trial, accuracy reporting the queried grating was worse than when it had not. Attention was likely drawn by the unexpected nature of these changes in direction of motion, since the effect was eliminated when the boundaries were visible (Experiment 2). This tendency for unexpected motion changes to attract attention has important consequences for the monitoring of objects in everyday environments.
    Attention Perception & Psychophysics 11/2010; 72(8):2087-95. · 1.97 Impact Factor

Full-text (2 Sources)

View
28 Downloads
Available from
May 28, 2014