Perception
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Amplitude Spectra of Line-Motion Stimuli The line-motion illusion has been regarded as the result of attention. An alternative interpretation is that the illusion is related to apparent motion which would predict the stimuli to contain motion energy associated with the direction of the illusory motion. In order to examine this possibility Fourier transforms of x – t plots of line-motion stimuli were generated under a variety of ... ...
Perception - Tập 40 Số 6 - Trang 656-673 - 2011
Intraattribute and Interattribute Motion Induction The phenomenon of motion induction occurs, for example, when a bar that is presented next to a spot, which itself was presented slightly earlier, is not correctly perceived to appear everywhere simultaneously, but seems to grow out of the spot. The spot is said to prime one end of the bar. Experiments have been designed to throw more light on the local and global aspects of this phenomeno... ...
Perception - Tập 23 Số 8 - Trang 913-928 - 1994
Processing Time of Contour Integration: The Role of Colour, Contrast, and Curvature We investigated the temporal properties of the red-green, blue – yellow, and luminance mechanisms in a contour-integration task which required the linking of orientation across space to detect a ‘path’. Reaction times were obtained for simple detection of the stimulus regardless of the presence of a path, and for path detection measured by a yes/no procedure with path and no-path stimuli ... ...
Perception - Tập 30 Số 7 - Trang 833-853 - 2001
Predicting the Future Position of a Moving Target Three experiments were conducted to examine the processes underlying the prediction of the future position of a moving target. A target moved horizontally across a computer screen at constant velocity, disappearing partway across the screen, and subjects responded when they estimated the target would have passed a point on the far side of the screen, had it continued on its path. The firs... ...
Perception - Tập 20 Số 1 - Trang 5-16 - 1991
When is Motion ‘Motion’? Examples of visual motion have become more and more abstract over the years, leading up to ‘third-order’ stimuli where direction is actually determined by the observer through top–down attention. But how far can this be pushed—are there motion stimuli that are yet more arbitrary and abstract? Actually, there is a broad class of ‘conceptual motion’ stimuli—things like a moving grating of f... ...
Perception - Tập 37 Số 4 - Trang 624-627 - 2008
Timing Accuracy in Motion Extrapolation: Reverse Effects of Target Size and Visible Extent of Motion at Low and High Speeds By varying target size, speed, and extent of visible motion we examined the timing accuracy in motion extrapolation. Small or large targets (0.2 or 0.8 deg) moved at either 2.5, 5, or 10 deg s−1 across a horizontal path (2.5 or 10 deg) and then vanished behind an occluder. Observers responded when they judged that the target had reached a randomly specified position b... ...
Perception - Tập 32 Số 6 - Trang 699-706 - 2003
The Relationship between Visual Persistence and Event Perception in Bistable Motion Display observers viewed two alternating frames, each consisting of three rectangular bars displaced laterally by one cycle in one frame with respect to the other. At long interframe intervals (IFIs) observers perceived a group of three bars moving as a whole (group motion), and at short IFIs the overlapping elements in the two frames appeared stationary, while the third element appeared to move ... ...
Perception - Tập 19 Số 4 - Trang 437-445 - 1990
The Evolution of Explanations of a Perceptual Phenomenon: A Case History Using the Ternus Effect The Ternus effect involves a multi-element stimulus that can lead to either of two different percepts of apparent movement depending upon a variety of stimulus conditions. Since Ternus's 1926 discussion of this phenomenon, many researchers have attempted to explain it. We examine the history of explanations of the Ternus effect and show that they have evolved to contemporary theoretical p... ...
Perception - Tập 35 Số 6 - Trang 807-821 - 2006
Perceptual Organization of Apparent Motion in the Ternus Display A typical Ternus display has three sequentially presented frames, in which frame 1 consists of three motion tokens, frame 2 (blank) defines the interstimulus interval, and frame 3 has similar motion tokens with their relative positions shifted to the right. Interestingly, what appears to be a seemingly simple arrangement of stimuli can induce one of two distinct apparent-motion percepts i... ...
Perception - Tập 28 Số 7 - Trang 877-892 - 1999
Spatial Correspondence and Relation Correspondence: Grouping Factors That Influence Perception of the Ternus Display We cite two different perceptual-correspondence principles whose emphasis can help to disambiguate the otherwise ambiguous Ternus display in apparent movement (a display that can alternately be seen in one of two possible configurations). One of these principles is spatial correspondence, which emphasizes the maintenance of similar stimulus elements in given locations over time. The other... ...
Perception - Tập 37 Số 5 - Trang 725-739 - 2008
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