Search results for: Burkhart Fischer

Items from 1 to 12 out of 12 results

article

Lifespan development of pro- and anti-saccades: Multiple regression models for point estimates

Christoph Klein, Friedrich Foerster, Klaus Hartnegg, Burkhart Fischer

Developmental Brain Research > 2005 > 160 > 2 > 113-123

The comparative study of anti- and pro-saccade task performance contributes to our functional understanding of the frontal lobes, their alterations in psychiatric or neurological populations, and their changes during the life span. In the present study, we apply regression analysis to model life span developmental effects on various pro- and anti-saccade task parameters, using data of a non-representative...

article

Instrumental and test–retest reliability of saccadic measures

Christoph Klein, Burkhart Fischer

Biological Psychology > 2005 > 68 > 3 > 201-213

Little is known about the reliabilities of the various measures of saccade control that can be derived from pro- and anti-saccade tasks. This paper presents correlational results of 2 different studies comprising altogether 446 psychiatrically and neurologically healthy participants in the range of 6–88 years. Saccades were elicited under different stimulation conditions and during task blocks of...

article

Developmental fractionation and differential discrimination of the anti-saccadic direction error

Christoph Klein, Burkhart Fischer

Experimental Brain Research > 2005 > 165 > 1 > 132-138

This partial re-analysis of the data of a total of 433 experimental sessions transfers the distinction of “express” and “regular” latency ranges from the pro-saccade task to the latencies of the anti-saccadic direction errors. Express errors and express saccades (ES) loaded on one and the same PCA factor, and both variables were subject to only minor developmental changes from childhood to young adulthood...

article

Age effects in dynamic vision based on orientation identification

Burkhart Fischer, Klaus Hartnegg

Experimental Brain Research > 2002 > 143 > 1

Abstract. Dynamic vision considers the time domain of visual processing, presumably a function of the magnocellular system. The temporal visual component is not completely developed at the beginning of school age. The effects of age on a certain aspect of dynamic visual perception are reported in this study of 286 subjects in the age range of 768years. Three simple orientation identification tasks...

article

A turn-key transportable eye-tracking instrument for clinical assessment

Klaus Hartnegg, Burkhart Fischer

Behavior Research Methods > 2002 > 34 > 4 > 625-629

This paper describes a combined instrument (eye tracker and target generator, both head mounted, with integrated data analysis) that tests parameters of saccadic eye movement and fixation control to give insight into the status of functional brain systems. Using three minilasers, the target generator projects three visual stimuli, a fixation point and two lateral stimuli, with programmable timing...

article

Age effects in dynamic vision based on orientation identification

Burkhart Fischer, Klaus Hartnegg

Experimental Brain Research > 2002 > 143 > 1 > 120-125

Dynamic vision considers the time domain of visual processing, presumably a function of the magnocellular system. The temporal visual component is not completely developed at the beginning of school age. The effects of age on a certain aspect of dynamic visual perception are reported in this study of 286 subjects in the age range of 7–68 years. Three simple orientation identification tasks were used:...

article

On the production and correction of involuntary prosaccades in a gap antisaccade task

Burkhart Fischer, Stefan Gezeck, Klaus Hartnegg

Vision Research > 2000 > 40 > 16 > 2211 - 2217

In an antisaccade task, where saccades in the direction opposite of a suddenly presented stimulus are required, certain numbers of prosaccades can occur. The hypothesis is put forward that poor fixation and poor voluntary saccade control constitute two independent sources for the errors. This possibility is investigated by including the corrections of the errors in the analysis. First, the eye movements...

article

97 Voluntary saccadic control and fixation in dyslexia

Burkhart Fischer, Monica Biscaldi, Klaus Hartnegg

International Journal of Psychophysiology > 1998 > 30 > 1-2 > 40

article

The antisaccade: a review of basic research and clinical studies

Stefan Everling, Burkhart Fischer

Neuropsychologia > 1998 > 36 > 9 > 885-899

The ability to suppress reflexive responses in favor of voluntary motor acts is crucial for everyday life. Both abilities can be tested with an oculomotor task, the antisaccade task. This task requires subjects to suppress a reflexive prosaccade to a flashed visual stimulus and instead to generate a voluntary saccade to the opposite side. This article reviews what is currently known about the neural...

article

Saccadic Reaction Times: a Statistical Analysis of Multimodal Distributions

Stefan Gezeck, Burkhart Fischer, Jens Timmer

Vision Research > 1997 > 37 > 15 > 2119-2131

The distributions of saccadic reaction times (SRT) often deviate from unimodal normal distributions. An excess-mass procedure was used to detect peaks in 963 data sets containing 90,927 reaction times from 170 subjects. About 55% showed one, 30% two, 12% three and 3% four peaks. According to their clustering along the reaction time scale the modes could be classified into express (90-120 msec),...

article

Intertrial effects of randomization on saccadic reaction times in human observers

Heike Weber, Monica Biscaldi, Burkhart Fischer

Vision Research > 1995 > 35 > 18 > 2615-2642

We investigated the effect of randomizing different spatial and temporal parameters on saccadic reaction times (SRTs) in five human subjects, to explore the relative occurrence of express and regular saccades. Parameters randomized in various test sessions were: target direction (right/left), intertrial interval, fixation foreperiod and gap duration (two or three different gap durations between 0...

article

The three-loop model: a neural network for the generation of saccadic reaction times

Burkhart Fischer, Stefan Gezeck, Wolfgang Huber

Biological Cybernetics > 1995 > 72 > 3 > 185-196

Abstract.This paper presents a computer simulation of the three-loop model for the temporal aspects of the generation of visually guided saccadic eye movements. The intention is to reproduce complex experimental reaction time distributions by a simple neural network. The operating elements are artificial but realistic neurones. Four modules are constructed, each consisting of 16 neural elements. Within...

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