Speed and accuracy of saccadic eye movements: Characteristics of impulse variability in the oculomotor system.

Abrams, Richard A.; Meyer, David E.; Kornblum, Sylvan

doi:10.1037/0096-1523.15.3.529

Cited by 165 publications

(164 citation statements)

References 57 publications

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“…An occasionalexperiment (we found two, both conducted by the same primary investigator: Abrams & Jonides, 1988;Abrams, Meyer, & Kornblum, 1989) has been designed so that the eye tracker calibration was objectivelyverified before every trial and the actual test criterion was reported in the experimental write-up. In each experiment, the participant was instructed to fixate a set of crosshairs between each trial, and the output of the eye tracker is automatically verified to be within range of this location on the display.…”

Section: Problem 2: When Eye Tracker Accuracy Deteriorates Below a Thmentioning

confidence: 99%

“…Many eye-tracking experiments entail tasks much more complex than looking at a set of crosshairs and then making a single saccade to a target (the task in Jonides, 1988, andAbrams et al, 1989). Eye trackers are becoming more widely used to monitor and evaluate eye movement patterns in realistic task settings, such as searching through a number of Web sites looking for information Pirolli, Card, & Van Der Wege, 2001).…”

Section: Problem 2: When Eye Tracker Accuracy Deteriorates Below a Thmentioning

confidence: 99%

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Cleaning up systematic error in eye-tracking data by using required fixation locations

Hornof

Halverson

2002

Behavior Research Methods, Instruments, & Computers

159

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In the course of running an eye-tracking experiment, one computer system or subsystem typically presents the stimuli to the participant and records manual responses, and another collects the eye movement data, with little interaction between the two during the course of the experiment. This article demonstrates how the two systems can interact with each other to facilitate a richer set of experimental designs and applications and to produce more accurate eye tracking data. In an eye-tracking study, a participant is periodically instructed to look at specific screen locations, or explicit required fixation locations (RFLs), in order to calibrate the eye tracker to the participant. The design of an experimental procedure will also often produce a number of implicit RFLs-screen locations that the participant must look at within a certain window of time or at a certain moment in order to successfully and correctly accomplish a task, but without explicit instructions to fixate those locations. In these windows of time or at these moments, the disparity between the fixations recorded by the eye tracker and the screen locations corresponding to implicit RFLs can be examined, and the results of the comparison can be used for a variety of purposes. This article shows how the disparity can be used to monitor the deterioration in the accuracy of the eye tracker calibration and to automatically invoke a recalibration procedure when necessary.This article also demonstrates how the disparity will vary across screen regions and participants and how each participant's unique error signature can be used to reduce the systematic error in the eye movement data collected for that participant.

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Section: Problem 2: When Eye Tracker Accuracy Deteriorates Below a Thmentioning

confidence: 99%

Section: Problem 2: When Eye Tracker Accuracy Deteriorates Below a Thmentioning

confidence: 99%

Cleaning up systematic error in eye-tracking data by using required fixation locations

Hornof

Halverson

2002

Behavior Research Methods, Instruments, & Computers

159

View full text Add to dashboard Cite

show abstract

“…It could also translate to more tightly clustered landing positions, meaning an effect on the spread or variance of landing position defined with respect to the centroid. We should note here that the speed and accuracy of eye movements are not independent and a speed/accuracy tradeoff is known to exist (e.g., [36]). Summary statistics for our data showed that the distance between the centroid of the target shape and the actual landing point of the saccade was negatively correlated to saccade latency, meaning that faster saccades indeed tended to be less accurate.…”

Section: Resultsmentioning

confidence: 99%

Peripheral Contour Grouping and Saccade Targeting: The Role of Mirror Symmetry

Sassi¹,

Demeyer²,

Wagemans³

2014

Symmetry

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Abstract:Integrating shape contours in the visual periphery is vital to our ability to locate objects and thus make targeted saccadic eye movements to efficiently explore our surroundings. We tested whether global shape symmetry facilitates peripheral contour integration and saccade targeting in three experiments, in which observers responded to a successful peripheral contour detection by making a saccade towards the target shape. The target contours were horizontally (Experiment 1) or vertically (Experiments 2 and 3) mirror symmetric. Observers responded by making a horizontal (Experiments 1 and 2) or vertical (Experiment 3) eye movement. Based on an analysis of the saccadic latency and accuracy, we conclude that the figure-ground cue of global mirror symmetry in the periphery has little effect on contour integration or on the speed and precision with which saccades are targeted towards objects. The role of mirror symmetry may be more apparent under natural viewing conditions with multiple objects competing for attention, where symmetric regions in the visual field can pre-attentively signal the presence of objects, and thus attract eye movements.

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“…Note, however, that the numbers of corrective saccades did not differ between Word Positions 1, 3, and 5 in Experiment 3. Another possibility is that regressions for words located at the beginning of the sentence are less precise than for words located at the end because long saccades are less accurate than short saccades (see, e.g., Abrams, Meyer, & Kornblum, 1989). Clearly, more work needs to be done in order to understand how regressions are affected by word position and saccade programming.…”

Section: Discussionmentioning

confidence: 99%

The role of verbal memory in regressions during reading

2012

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During reading, participants generally move their eyes rightward on the line. A number of eye movements, called regressions, are made leftward, to words that have already been fixated. In the present study, we investigated the role of verbal memory during regressions. In Experiment 1, participants were asked to read sentences for comprehension. After reading, they were asked to make a regression to a target word presented auditorily. The results revealed that their regressions were guided by memory, as they differed from those of a control group who did not read the sentences. The role of verbal memory during regressions was then investigated by combining the reading task with articulatory suppression (Exps. 2 and 3). The results showed that articulatory suppression affected the size and the accuracy of the initial regression but had a minimal effect on corrective saccades. This suggests that verbal memory plays an important role in determining the location of the initial saccade during regressions.

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Speed and accuracy of saccadic eye movements: Characteristics of impulse variability in the oculomotor system.

Cited by 165 publications

References 57 publications

Cleaning up systematic error in eye-tracking data by using required fixation locations

Cleaning up systematic error in eye-tracking data by using required fixation locations

Peripheral Contour Grouping and Saccade Targeting: The Role of Mirror Symmetry

The role of verbal memory in regressions during reading

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