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Biomedical subjects

K J Süss

Publications and source records attributed to K J Süss.

6 recordsLinked to original sources
PubMed1982

Voluntary ocular tracking movements in response to a sinusoidally moving intermittently active sound source.

Voluntary eye movements in response to a sinusoidally moving, intermittently active sound source were investigated in 40 young healthy human subjects. Visual afferent input was prevented during the experiments. With increasing burst repetition rates of the sound source, different forms of eye movements were observed: a) so-called single and repetitive adversive movements consisting of saccades which occur with certain latencies in response to single bursts; b) so-called saccadic eye tracking movements which are characterized by numerous small saccades occurring in accordance with the target (sound source) movement but lacking a time correlation between the saccades and single bursts. It was found that saccadic eye tracking movements were performed instead of adversive movements when at least 4 to 10 bursts per movement period of the sound source was transmitted (with movement frequencies of the sound source from 0.1 to 0.5 Hz). Slight intersaccadic drifts, which could be regularly observed in all types of eye movements were interpreted as instability of fixation in darkness.

Auditory Perception↗
PubMed1981

Form and accuracy of voluntary ocular tracking movements in response to sinusoidally moving acoustic targets.

Form and accuracy of voluntary ocular tracking in response to a horizontal sinusoidally moving auditory stimulus were examined in complete darkness. Forty young, healthy subjects participated in the study. Ocular movements under the applied experimental conditions consisted of a succession of saccades whose direction corresponded to the motion of sound. Though slight intersaccadic drifts were observed, pure smooth pursuit movements could not be recorded. A comparison of the amplitude of sound motion and the corresponding ocular motion showed the latter to be rather inaccurate. Independent of the actual amplitude of the sound motion (+/- 15 degrees up to +/- 90 degrees) the amplitude of the ocular movements, in most cases, remained constant within a range of approximately +/- 35 degrees to +/- 45 degrees. The accuracy in respect to phase relationship between target movement and ocular response was quite good. In response to sinusoidal motion of the sound, the ocular movements usually occurred simultaneously up to 0.5 Hz.

Acoustic Stimulation↗
PubMed1981

Acoustic-induced eye movements.

This article reports the influence of moving acoustic signals on eye movements (oculomotor functions) using 350 healthy test subjects. An acoustic test setting developed especially for this purpose has made possible the application of moving acoustic signals of varying frequency and form (square stimuli, sinusoidal stimuli, circular movements), as well as the examination of visual-acoustic and vestibular-acoustic interactions. It must be stressed that according to these investigations, both voluntary and involuntary eye movements can be demonstrated in response to moving acoustic signals. Involuntary eye movements, however, under th given experimental conditions, only are observed in about 20% of all test subjects and their frequency of occurrence is highest in young female subjects. They are most pronounced in darkness and when there is no fixation, and they can be coupled to varying degrees with the given acoustic signal. Voluntary and involuntary eye movements do not differ very much from one another. They consist mainly of a series of saccades that form staircase jerks. In both cases, no typical smooth movements or nystagmoid movement forms occur--which are predominant in tracking eye movements of visual stimuli. Occasionally, slight drifting movements can be demonstrated in the intersaccadic intervals. At a larger movement amplitude and increased movement frequency of the sound signal, pure opposite jerks finally appear, which follow up to a movement frequency of 1 Hz. The eye movements are influenced only slightly by a change in the amplitude of the sound movement (+/- 15 degrees to +/- 90 degrees). However, a close phase relationship between eye and sound movement exists. If instead of continuous acoustic signals (music), single burst signals are given at an increasing repetition rate, this results (at low repetition rates of bursts) in orienting reactions upon the individual signals, while at high signal repetition rates (above 0.5 Hz), continuous eye movements in the form of staircase jerks result. In investigating acoustically induced tracking eye movements, many new questions have arisen that previously have been open only to psychophysical studies.

Auditory Pathways↗
PubMedDate not supplied

Moving sound sources: techniques and applications.

A stimulating device for the application of moving acoustic signals of varying form and velocity is described. The apparatus functions on the principle of intensity stereophony and permits continuous smooth sound movements in a vast range of different forms and frequencies. Furthermore, simultaneous application of vestibular and optokinetic stimuli is possible. Cortically evoked potentials, voluntary and involuntary eye movements, and influences upon body sway from moving acoustic signals are offered as examples for applicability.

Acoustic Stimulation↗