scholarly journals Manual reaction time during a memory-guided delayed saccade task

2004 ◽  
Vol 4 (8) ◽  
pp. 446-446 ◽  
Author(s):  
Y. B. Sirotin ◽  
S. B. Krishna ◽  
J. W. Bisley ◽  
S. C. Steenrod ◽  
M. E. Goldberg
Keyword(s):  
Reaction Time ◽  
Saccade Task ◽  
Manual Reaction Time

Unwanted reflex-like saccades in visual extinction patients

1999 ◽  
Vol 22 (4) ◽  
pp. 683-683 ◽  
Author(s):  
Alessandra Fanini ◽  
Carlo Alberto Marzi
Keyword(s):  
Reaction Time ◽  
Right Hemisphere ◽  
Visual Stimuli ◽  
Reaction Time Task ◽  
Time Task ◽  
Right Hemisphere Damage ◽  
Visual Extinction ◽  
Manual Reaction Time

We studied patients with left visual extinction following right hemisphere damage in a simple manual reaction time task using brief visual stimuli. With unilateral lateralized stimuli the patients showed a high proportion of unwanted, reflex-like saccades to either side of stimulation. In contrast, with bilateral stimuli there was an overall decrease in the proportion of unwanted saccades, and the vast majority of them were directed toward the ipsilesional side. The implications of these results for the Findlay & Walker model are discussed.

scholarly journals Revealing the Radial Effect on Orientation Discrimination by Manual Reaction Time

2017 ◽  
Vol 11 ◽  
Author(s):  
Lixin Liang ◽  
Yang Zhou ◽  
Mingsha Zhang ◽  
Yujun Pan
Keyword(s):  
Reaction Time ◽  
Orientation Discrimination ◽  
Manual Reaction Time

scholarly journals Children who stutter exchange linguistic accuracy for processing speed in sentence comprehension

2016 ◽  
Vol 38 (2) ◽  
pp. 263-287 ◽  
Author(s):  
TALITA FORTUNATO-TAVARES ◽  
PETER HOWELL ◽  
RICHARD G. SCHWARTZ ◽  
CLAUDIA R. FURQUIM DE ANDRADE
Keyword(s):  
Working Memory ◽  
Reaction Time ◽  
Processing Speed ◽  
Sentence Comprehension ◽  
Motor Reaction ◽  
Motor Reaction Time ◽  
Comprehension Task ◽  
Speed Accuracy ◽  
Manual Reaction Time

ABSTRACTComprehension of predicates and reflexives was examined in children who stutter (CWS) and children who do not stutter (CWNS) who were between 9 years, 7 months and 10 years, 2 months. Demands on working memory and manual reaction time were also assessed in two experiments that employed a four-choice picture-selection sentence comprehension task. CWS were less accurate than CWNS on the attachment of predicates. For reflexives, there was no between-group difference in accuracy, but there was a difference in speed. The two constructions induced processing at different points on a speed–accuracy continuum with CWS sacrificing accuracy to respond fast with predicates, while they maintained accuracy of reflexives by responding slower relative to CWNS. Predicates made more demands on language than nonspeech motor reaction time, whereas the reverse was the case with reflexives for CWS compared to CWNS.

Saccades to somatosensory targets. I. behavioral characteristics

1996 ◽  
Vol 75 (1) ◽  
pp. 412-427 ◽  
Author(s):  
J. M. Groh ◽  
D. L. Sparks
Keyword(s):  
Reaction Time ◽  
Target Location ◽  
Human Subjects ◽  
Reaction Times ◽  
Saccade Target ◽  
Velocity Amplitude ◽  
Visual Frame ◽  
Saccade Velocity ◽  
Saccade Task ◽  
Visual Targets

1. We compared the properties of saccades to somatosensory and visual targets. This comparison provides insight into the translation of sensory signals coding target location in different sensory coordinate frameworks into motor commands of a common format. Vibrotactile stimuli were delivered to the hands, which were fixed in position and concealed beneath a barrier. Saccades of different directions and amplitudes were elicited by the same somatosensory target from different initial eye positions. Both monkeys and humans served as subjects. 2. Somatosensory saccades were less accurate than visual saccades in both humans and monkeys. When the barrier concealing the hands was removed, somatosensory saccade accuracy improved. While the hands were concealed, the visual frame of reference provided by room illumination did not greatly affect saccade accuracy: accuracy was not degraded in complete darkness for two of three monkeys. 3. The endpoints of saccades to a single somatosensory target varied with initial eye position for the monkeys, but not for the human subjects. 4. We also found evidence of an effect of limb position on somatosensory saccades: when human subjects performed the task with crossed hands, the incidence of curved saccades increased. Saccades often began in the direction of the unstimulated hand and curved markedly toward the stimulated hand. When one subject was required to delay the saccade by 600-1,000 ms after target onset (the delayed saccade task), the saccades were straight. Somatosensory saccades were also straight when the hands were not crossed. 5. The reaction times of somatosensory saccades were longer than the reaction times of visual saccades, and they decreased as a function of saccade amplitude. The delayed saccade task reduced the differences between somatosensory and visual saccade reaction times. The reaction times of saccades to very dim visual targets increased into the range found for saccades to somatosensory targets. When the saccade target was the combination of the somatosensory and visual stimuli at the same location, the reaction time was slightly lower than for visual targets alone. 6. The peak velocities of somatosensory saccades were lower than those of visual saccades of the same amplitude. The velocities of saccades to combined somatosensory and visual targets were indistinguishable from those of saccades to visual targets alone. The differences between somatosensory and visual saccade velocity were maintained in the delayed trial type. These differences suggest that the main sequence or velocity-amplitude relationship characteristic of saccades depends on the modality of the target. 7. The implications of these modality-dependent differences in accuracy, reaction time, and saccade velocity are discussed with regard to models of the saccade generator and the coordinate transformation necessary for somatosensory saccades.

A Primary-Secondary Task Paradigm for Estimating Processing Capacity during Speech Production: Some Preliminary Data1

1987 ◽  
Vol 60 (3_part_2) ◽  
pp. 1279-1286
Author(s):  
Thomas F. Campbell ◽  
John F. Keegan
Keyword(s):  
Reaction Time ◽  
Target Word ◽  
Speech Production ◽  
Preliminary Data ◽  
Secondary Task ◽  
Reaction Time Task ◽  
Processing Capacity ◽  
Methodological Issues ◽  
Linguistic Complexity ◽  
Manual Reaction Time

In the present paper, a primary-secondary task paradigm is presented for estimating the amount of processing capacity required for correct production of stimulus words that differ in linguistic complexity. The procedure requires subjects to produce the desired target word (primary task) while performing a manual reaction time task (secondary task). The secondary task consists of pressing a hand switch in response to an auditory tone that occurs at the start of the target-word production. The amount of processing capacity needed for correct production is estimated by the reaction time to the tone. Preliminary data are presented and methodological issues and questions for research are discussed.

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