Saccades reveal that allocentric coding of the moving object causes mislocalization in the flash-lag effect

Becker, Stefanie I.; Ansorge, Ulrich; Turatto, Massimo

doi:10.3758/app.71.6.1313

Cited by 10 publications

(20 citation statements)

References 39 publications

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“…Consistent with the results of Wong and Mack (1981), the effect of the visual motion on saccadic localization increased with longer delays, albeit on a shorter timescale; saccade errors were larger with long-latency saccades, on the order of 250 – 600ms (de’Sperati & Baud-Bovy, 2008; Zimmermann et al, 2012). In addition, memory-guided saccades to a flash-lag stimulus, in which a stationary flash appears to lag behind an adjacent moving object (Nijhawan, 1994) are consistent with the illusion; landing locations are accurate when subjects saccade the flashed object, but are shifted in the direction of the motion when saccades are directed to the location of the moving object (Becker, Ansorge, & Turatto, 2009). …”

Section: Discussionmentioning

confidence: 86%

Visual motion shifts saccade targets

Kosovicheva

Wolfe

Whitney

2014

Atten Percept Psychophys

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Saccades are made thousands of times a day, and are the principal means of localizing objects in our environment. However, the saccade system faces a challenge in accurately localizing objects as they are constantly moving relative to the eye and head. Any delays in processing could cause errors in saccadic localization. To compensate for these delays, the saccade system might use one or more sources of information to predict future target locations, including changes in position of the object over time, or its motion. Another possibility is that motion influences the represented position of the object for saccadic targeting, without requiring an actual change in target position. We tested whether the saccade system can use motion-induced position shifts to update the represented spatial location of a saccade target by using a static drifting Gabor patch with either a soft or hard aperture as a saccade target. In both conditions, the aperture always remained at a fixed retinal location. The soft aperture Gabor patch resulted in an illusory position shift, whereas the hard aperture stimulus maintained the motion signals but resulted in a smaller illusory position shift. Thus, motion energy and target location were equated, but a position shift was generated in only one condition. We measured saccadic localization of these targets and found that saccades were indeed shifted, but only with a soft aperture Gabor patch. Our results suggest that motion shifts the programmed locations of saccade targets, and this remapped location guides saccadic localization.

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Section: Discussionmentioning

confidence: 86%

Visual motion shifts saccade targets

Kosovicheva

Wolfe

Whitney

2014

Atten Percept Psychophys

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“…Thus, differences in encoding related to the frame of reference might account for mislocalization of the moving target. However, it seems possible that the sequence, rather tban the encoding format, is more critical (i.e., in Becker et al, 2009, the flashed object is always encoded before the moving target is encoded).^ Also, it is not clear whether differences between allocentric encoding and egocentric encoding could account for a flash-lag effect in nonspatial visual stimuli (e.g., Sheth et al, 2000) or nonvisual stimuM (e.g.. Alais & Burr, 2003). Gauch and Kerzel (2008a) reported a larger flasb-lag effect occurred with a moving flashed object than with a stationary flashed object in flash-initiated or flash-terminated displays, but no differences in the flash-lag effect occurred as a function of whether the flashed object was moving or stationary in flash-midpoint displays.…”

Section: Temporal Samplingmentioning

confidence: 97%

“…Blohm et al reported early localization of the flashed object did not suggest a flash-lag effect, but after the position of the flashed object was translated from egocentric coordinates into allocentric coordinates, gaze direction suggested a flash-lag effect. Blohm et al speculated the influence on the flash-lag effect of target motion immediately after the flashed object was presented (e.g.,Eagleman & Sejnowski, 2000b;Krekelberg & Lappe, 2000a) might reflect the time required to translate from initial egocentric coordinates to allocentric coordinates (cf Becker et al, 2009)…”

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confidence: 99%

The flash-lag effect and related mislocalizations: Findings, properties, and theories.

Hubbard

2014

Psychological Bulletin

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If an observer sees a flashed (briefly presented) object that is aligned with a moving target, the perceived position of the flashed object usually lags the perceived position of the moving target. This has been referred to as the flash-lag effect, and the flash-lag effect has been suggested to reflect how an observer compensates for delays in perception that are due to neural processing times and is thus able to interact with dynamic stimuli in real time. Characteristics of the stimulus and of the observer that influence the flash-lag effect are reviewed, and the sensitivity or robustness of the flash-lag effect to numerous variables is discussed. Properties of the flash-lag effect and how the flash-lag effect might be related to several other perceptual and cognitive processes and phenomena are considered. Unresolved empirical issues are noted. Theories of the flash-lag effect are reviewed, and evidence inconsistent with each theory is noted. The flash-lag effect appears to involve low-level perceptual processes and high-level cognitive processes, reflects the operation of multiple mechanisms, occurs in numerous stimulus dimensions, and occurs within and across multiple modalities. It is suggested that the flash-lag effect derives from more basic mislocalizations of the moving target or flashed object and that understanding and analysis of the flash-lag effect should focus on these more basic mislocalizations rather than on the relationship between the moving target and the flashed object.

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“…Studies of the FLE usually involve judgment of relative position (but see Munger and Owens, 2004; Shi and de'Sperati, 2008; Becker et al, 2009), whereas studies of RM usually involve judgment of absolute position; however, regardless of whether relative or absolute position is judged, represented target position in the FLE and in RM is displaced in the direction of target motion. The FLE (Maiche et al, 2007) and RM are influenced by whether another stimulus provides a landmark (Hubbard and Ruppel, 1999) or surrounding context (Hubbard, 1993), and localization of the flashed object in the FLE (van Beers et al, 2001) and moving target in RM (Hubbard, 1990, 1997) are influenced by the direction of implied gravitational attraction 1 .…”

Section: Apparent Similarities Of the Fle And Rmmentioning

confidence: 99%

Do the flash-lag effect and representational momentum involve similar extrapolations?

Hubbard¹

2013

Front. Psychol.

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In the flash-lag effect (FLE) and in representational momentum (RM), the represented position of a moving target is displaced in the direction of motion. Effects of numerous variables on the FLE and on RM are briefly considered. In many cases, variables appear to have the same effect on the FLE and on RM, and this is consistent with a hypothesis that displacements in the FLE and in RM result from overlapping or similar mechanisms. In other cases, variables initially appear to have different effects on the FLE and on RM, but accounts reconciling those apparent differences with a hypothesis of overlapping or similar mechanisms are suggested. Given that RM is simpler and accounts for a wider range of findings (i.e., RM involves a single stimulus rather than the relationship between two stimuli, RM accounts for displacement in absolute position of a single stimulus and for differences in relative position of two stimuli), it is suggested that (at least some cases of) the FLE might be a special case of RM in which the position of the target is assessed relative to the position of another stimulus (i.e., the flashed object) rather than relative to the actual position of the target.

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Saccades reveal that allocentric coding of the moving object causes mislocalization in the flash-lag effect

Cited by 10 publications

References 39 publications

Visual motion shifts saccade targets

Visual motion shifts saccade targets

The flash-lag effect and related mislocalizations: Findings, properties, and theories.

Do the flash-lag effect and representational momentum involve similar extrapolations?

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