Conditioned audio-visual targeting reflexes in split brain cats.

Area of Science:

• Neuroscience
• Animal Behavior
• Auditory Neuroscience

Background:

• Conditioned reflexes are crucial for sensory-guided behaviors.
• The corpus callosum facilitates interhemispheric communication, vital for integrating sensory information.
• Understanding its role in audio-visual reflexes provides insights into brain function.

Purpose of the Study:

• To investigate the effect of corpus callosum transection on the acquisition and retention of a conditioned audio-visual targeting reflex in cats.
• To determine if pre-operative experience influences the recovery of function after split-brain surgery.
• To explore the differential impact of sound source location on reflex integration post-transection.

Main Methods:

• Elaboration of a conditioned audio-visual targeting reflex in 12 freely moving cats using auditory stimuli from eight loudspeakers.
• Assessment of normal cats' learning curves for frontal and posterior sound sources.
• Investigation of reflex retention and relearning in split-brain cats (corpus callosum transection) with and without pre-operative training.

Main Results:

• Normal cats achieved 80% criterion for frontal and posterior targets in 20 and 30 sessions, respectively.
• Split-brain cats with prior training showed no retention but relearned frontal targeting in 20 sessions; posterior targeting was not relearned.
• Cats trained only post-surgery failed to reach the 80% criterion within 50 sessions.

Conclusions:

• Corpus callosum transection significantly disrupts the integration of audio-visual targeting reflexes.
• The impact of callosal transection is dependent on the sound source's location (anterior vs. posterior).
• Pre-operative experience plays a critical role in the ability to relearn auditory targeting tasks after split-brain surgery.