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Eye and head movements to visual and auditory targets
H Siegmund1, M Stoppa, G Santibáñez
1Institute of Physiology, Humboldt University, Berlin.
Activitas Nervosa Superior
|June 1, 1987
Summary
Coordinated eye-head movements are faster with auditory or audio-visual stimuli compared to visual-only stimuli. Response times vary based on target location and sensory input, offering insights into orientation mechanisms.
Area of Science:
- Neuroscience
- Human Motor Control
- Sensory Integration
Background:
- Coordinated eye-head movements are crucial for orienting to stimuli.
- Understanding the initial event in this orientation is key to deciphering sensory processing.
Purpose of the Study:
- To investigate the reaction times of eye and head movements to visual, auditory, and audio-visual targets.
- To determine how stimulus modality and location affect coordinated orientation responses.
Main Methods:
- Studied 24 human subjects performing coordinated eye-head movements.
- Presented visual, auditory, and combined audio-visual targets at a 60-degree location.
- Measured latencies of eye and head movements.
Main Results:
- Auditory targets elicited shorter eye and head movement latencies than visual targets.
- Bisensory (audio-visual) targets resulted in shorter latencies than monosensory targets.
- Stimulus modality and target eccentricity differentially influenced eye and head latencies.
Conclusions:
- Sensory modality and target location significantly impact the initiation of coordinated eye-head orientation.
- Differences in responses are partly explained by perceptual and central processing mechanisms.
- Findings contribute to understanding the initial neural events in orienting behaviors.