The Superior Colliculus and Head Movements in the Cat
The Superior Colliculus and Head Movements in the Cat
There seems to be little doubt that the superior colliculus of the cat plays a crucial role in head movement. The proof comes largely from a single kind of experiment in which the superior colliculus is stimulated electrically and occasionally chemically. The movements that stimulation generates have long been regarded as close to natural movement. Some believe that stimulating the tectum and protectum led to the animals executing turning movements, and gave to them the term, “visual-grasp reflex.” The experiments by Apter were on anesthetized cats. In this case, crystals of strychnine were place on the exposed superior colliculus. The application of the crystals first caused an increase in the visual evoked potential.
Keywords: superior colliculus, cats, visual-grasp reflex, Apter, strychnine, head movements
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