The amplitude and angle of saccades to double-step target displacements

Aslin, Richard Ν.; Shea, Sandra L.

doi:10.1016/0042-6989(87)90058-7

Cited by 75 publications

(59 citation statements)

References 10 publications

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“…2.4, the model does not cover the process of saccade generation itself. Previous models of saccade generation using DNFs (Kopecz and Schöner 1995;Wilimzig et al 2006) have addressed how the metric distance between saccade targets determines whether selection or averaging occurs, including in double-step paradigms (Ottes et al 1984;Aslin and Shea 1987). DNF models have addressed repulsion and attraction effects between metrically close items in related work on spatial working memory (Simmering et al 2008).…”

Section: Trans-saccadic Spatial Memorymentioning

confidence: 99%

A neural mechanism for coordinate transformation predicts pre-saccadic remapping

Schneegans

Schöner

2012

Biol Cybern

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Whenever we shift our gaze, any location information encoded in the retinocentric reference frame that is predominant in the visual system is obliterated. How is spatial memory retained across gaze changes? Two different explanations have been proposed: Retinocentric information may be transformed into a gaze-invariant representation through a mechanism consistent with gain fields observed in parietal cortex, or retinocentric information may be updated in anticipation of the shift expected with every gaze change, a proposal consistent with neural observations in LIP. The explanations were considered incompatible with each other, because retinocentric update is observed before the gaze shift has terminated. Here, we show that a neural dynamic mechanism for coordinate transformation can also account for retinocentric updating. Our model postulates an extended mechanism of reference frame transformation that is based on bidirectional mapping between a retinocentric and a bodycentered representation and that enables transforming multiple object locations in parallel. The dynamic coupling between the two reference frames generates a shift of the retinocentric representation for every gaze change. We account for the predictive nature of the observed remapping activity by using the same kind of neural mechanism to generate an internal representation of gaze direction that is predictively updated based on corollary discharge signals. We provide evidence for the model by accounting for a series of behavioral and neural experimental observations.

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Section: Trans-saccadic Spatial Memorymentioning

confidence: 99%

A neural mechanism for coordinate transformation predicts pre-saccadic remapping

Schneegans

Schöner

2012

Biol Cybern

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“…The double-step task is particularly well suited to study oculomotor decisions (Aslin and Shea 1987;Becker and Jurgens 1979;Komoda et al 1973;Lisberger et al 1975;Ray et al 2004;Westheimer 1954;Wheeless et al 1966). Abruptly changing the location of the target and measuring the ability of the oculomotor system to compensate for the target shift can assess the temporal evolution of decision-making.…”

Section: Decisions and Motor Planning During Error Correctionmentioning

confidence: 99%

“…In a typical double-step task, the amplitude of the resulting saccade as a function of reprocessing times is known to describe what is called an amplitude ( function (AngTF) (Aslin and Shea 1987;Becker and Jurgens 1979;Findlay and Harris 1984;Ludwig et al 2007). Because in our experiment the shift in the final target is akin to a traditional double-step, we calculated the time associated with the reprocessing of corrective saccade endpoints from the old to the new final target location.…”

Section: Decisions and Motor Planning During Error Correctionmentioning

confidence: 99%

“…Assuming that the perception of the new final target position began only at the end of the first erroneous saccade, the intersaccadic interval between the error and the corrective saccades gave us the delay (D) (Becker and Jurgens 1979) that must elapse if the third step is to modify the corrective saccade that is being prepared in response to the second step. By fitting a cumulative Weibull function to the endpoints of the corrective saccades as a function of this delay (Aslin and Shea 1987), we calculated the time needed to complete the transition between the two limiting values of the amplitude known as transition time (Tw). We found a good agreement between our estimates of the transition time (Tw ϳ112 ms) and those reported by Becker and Jurgen (1979), where Tw ranged from 80 to 200 ms with a mean of 120 ms.…”

Section: Decisions and Motor Planning During Error Correctionmentioning

confidence: 99%

“…The task used in this study is a modified version of the double-step task (Aslin and Shea 1987;Becker and Jurgens 1979;Hou and Fender 1979;Lisberger et al 1975;Murthy et al 2000;Ray et al 2004) and consists of two kinds of trials: no-step trials in which only one target is presented (i.e., target is 'not stepped' to another location) and step trials in which two targets are presented in succession (or in other words, a target is presented and then "stepped" to a different location).…”

Section: Task and Stimulimentioning

confidence: 99%

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Control of Predictive Error Correction During a Saccadic Double-Step Task

Sharika¹,

Ramakrishnan²,

Murthy³

2008

Journal of Neurophysiology

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Sharika KM, Ramakrishnan A, Murthy A. Control of predictive error correction during a saccadic double-step task. J Neurophysiol 100: 2757-2770, 2008. First published September 24, 2008 doi:10.1152/jn.90238.2008. We explored the nature of control during error correction using a modified saccadic double-step task in which subjects cancelled the initial saccade to the first target and redirected gaze to a second target. Failure to inhibit was associated with a quick corrective saccade, suggesting that errors and corrections may be planned concurrently. However, because saccade programming constitutes a visual and a motor stage of preparation, the extent to which parallel processing occurs in anticipation of the error is not known. To estimate the time course of error correction, a triple-step condition was introduced that displaced the second target during the error. In these trials, corrective saccades directed at the location of the target prior to the third step suggest motor preparation of the corrective saccade in parallel with the error. To estimate the time course of motor preparation of the corrective saccade, further, we used an accumulator model (LATER) to fit the reaction times to the triple-step stimuli; the best-fit data revealed that the onset of correction could occur even before the start of the error. The estimated start of motor correction was also observed to be delayed as target step delay decreased, suggesting a form of interference between concurrent motor programs. Taken together we interpret these results to indicate that predictive error correction may occur concurrently while the oculomotor system is trying to inhibit an unwanted movement and suggest how inhibitory control and error correction may interact to enable goal-directed behaviors.

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Programming of Stimulus-Elicited Saccadic Eye Movements

Findlay¹

1992

Springer Series in Neuropsychology

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The amplitude and angle of saccades to double-step target displacements

Cited by 75 publications

References 10 publications

A neural mechanism for coordinate transformation predicts pre-saccadic remapping

A neural mechanism for coordinate transformation predicts pre-saccadic remapping

Control of Predictive Error Correction During a Saccadic Double-Step Task

Programming of Stimulus-Elicited Saccadic Eye Movements

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