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Audio-visual targeting reaction after unilateral lesions of the superior colliculus in cats
Abstract:
Cats were trained to visually localize one of eight loudspeakers distributed in different spatial locations. The animals localized the activated sound source through a directed movement of ears, eyes and head towards it. The number of correct targeting reactions triggered by a tone stimulus from different spatial positions was strongly impaired in the operated animals in comparison to controls. The number of correct responses was higher when the tone stimuIus was presented from the side of the lesion. The role of the superior colliculus in the integration of audio-visual targeting reaction is discussed.
Insights
Cats with superior colliculus lesions showed impaired audio-visual localization. Targeting accuracy decreased, especially for sounds on the lesioned side, highlighting the superior colliculus
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Sensory Integration
Background:
- The superior colliculus plays a crucial role in sensorimotor transformations, integrating sensory information for guiding movements.
- Auditory localization is essential for orienting responses to environmental stimuli.
- Understanding the neural mechanisms underlying audio-visual integration is vital for comprehending spatial awareness and navigation.
Purpose of the Study:
- To investigate the role of the superior colliculus in audio-visual sensory integration in cats.
- To assess the impact of superior colliculus lesions on the ability of cats to localize sound sources.
- To determine if the location of a sound stimulus relative to the lesion affects targeting accuracy.
Main Methods:
- Cats were trained to perform a visual localization task involving sound stimuli from eight spatial locations.
- Behavioral responses, including ear, eye, and head movements, were recorded.
- Surgical lesions were introduced to the superior colliculus in experimental groups, with control groups receiving sham operations.
Main Results:
- Cats with superior colliculus lesions exhibited significantly impaired performance in localizing sound sources compared to control animals.
- Targeting accuracy was reduced across various spatial locations following the lesion.
- A notable finding was the preserved, or even enhanced, targeting accuracy for sound stimuli presented on the side of the lesion.
Conclusions:
- The superior colliculus is critical for the accurate integration of auditory and visual information for spatial targeting behaviors.
- Lesions to the superior colliculus disrupt the ability to orient towards auditory stimuli, particularly when the stimulus is contralateral to the lesion.
- These findings underscore the importance of the superior colliculus in multisensory integration and sensorimotor control.