Predicting 2D Target Velocity Cannot Help 2D Motion Integration for Smooth Pursuit Initiation

Montagnini, Anna; Spering, Miriam; Masson, Guillaume S.

doi:10.1152/jn.00563.2006

Cited by 28 publications

(25 citation statements)

References 21 publications

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“…On the face of it, this conclusion might appear to be different from that drawn by Montagnini et al (2006), who held that object motion was needed for anticipatory smooth eye movements to occur. However, object motion referred to different characteristics of motion in the two studies.…”

Section: Discussionmentioning

confidence: 61%

“…One holds that anticipatory smooth eye movements in response to cues occur only under conditions where the expectations are able to generate salient representations of the expected motion (see Krauzlis, 2004 for a similar proposal with respect to the difficulty of generating imagined motion signals). On the basis of our results, we suggest that salient representations of the expected direction of motion, sufficient to drive anticipatory smooth eye movements, may be generated either from expectations of the sustained motion of objects, or expectations of the global motion of limited-lifetime RDKs (but perhaps not for the direction of the primitive and transient 1D motions studied by Montagnini et al, 2006). Cues about the lifetime of the elements (lifetime controls the signal/noise properties of the stimulus; Appendix A), on the other hand, may be ineffective because expectations about dot lifetime might not be helpful in constructing a perceptually salient representation of the expected motion.…”

Section: Discussionmentioning

confidence: 77%

“…However, object motion referred to different characteristics of motion in the two studies. Object motion in Montagnini et al (2006) referred to the 2D horizontal motion of a tilted line translating across space, which was different from the transient and more primitive 1D motion signals perpendicular to the orientation of the target line. They found that only the 2D motion, not the 1D motion, was associated with an anticipatory response.…”

Section: Discussionmentioning

confidence: 99%

“…Recent results by Montagnini, Spering, and Masson (2006) supported the view that signals representing object motion are needed to generate anticipatory responses and that other, more primitive motion signals are ineffective. This conclusion was based on their finding that anticipatory smooth eye movements in response to a tilted line moving horizontally could be evoked by expectations about the expected direction of object motion (i.e., 2D horizontal motion), and not by expectations about the direction of the more primitive 1D edge motion signals orthogonal to line orientation.…”

Section: Introductionmentioning

confidence: 91%

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Anticipatory smooth eye movements with random-dot kinematograms

2012

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Anticipatory smooth eye movements were studied in response to expectations of motion of random-dot kinematograms (RDKs). Dot lifetime was limited (52–208 ms) to prevent selection and tracking of the motion of local elements and to disrupt the perception of an object moving across space. Anticipatory smooth eye movements were found in response to cues signaling the future direction of global RDK motion, either prior to the onset of the RDK or prior to a change in its direction of motion. Cues signaling the lifetime of the dots were not effective. These results show that anticipatory smooth eye movements can be produced by expectations of global motion and do not require a sustained representation of an object or set of objects moving across space. At the same time, certain properties of global motion (direction) were more sensitive to cues than others (dot lifetime), suggesting that the rules by which prediction operates to influence pursuit may go beyond simple associations between cues and the upcoming motion of targets.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

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Anticipatory smooth eye movements with random-dot kinematograms

2012

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“…The brain has to resolve this conflict and select one of the two birds for pursuit. A previous study showed that top-down knowledge about the two-dimensional motion direction of a tilted bar does not allow to compensate for the biased one-dimensional edge motion (Montagnini, Spering, & Masson, 2006). This finding suggests that bottom-up stimulus information can even override top-down expectations.…”

Section: Introductionmentioning

confidence: 90%

Dynamic integration of information about salience and value for smooth pursuit eye movements

2015

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Eye movement behavior can be determined by bottom-up factors like visual salience and by top-down factors like expected value. These different types of signals have to be combined for the control of eye movements. In this study we investigated how smooth pursuit eye movements integrate salience and value information. Observers were asked to track a random-dot kinematogram containing two coherent motion directions. To manipulate salience, the coherence or the density of one of the motion signals was varied. To manipulate value, observers won or lost money in a separate experiment if they were tracking one or the other motion direction. Our results show that pursuit direction was initially determined only by salience. 300-400 ms after target motion onset, pursuit steered towards the rewarded direction and the salience effects disappeared. The time course of this effect depended crucially on the difficulty to segment the two signal directions. These results indicate that salience determines early pursuit responses in the same way as saccades with short latencies. Value information is processed slower and dominates pursuit after several 100 ms.

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