The experiments involved kittens being either raised in complete darkness or deprived of the sight in one eye by having their eyelids sewn shut. The kittens were then anaesthetised, artificially ventilated, and paralysed with a drug to prevent eye movements. They were then subjected to highly invasive head surgery during which the skin was cut away, the skull was opened, and the brain was exposed for recordings. After various tests, all the kittens were killed and parts of their brain removed for analysis.
Sophisticated methods of studying human vision and the underlying neurologic processes exist.
The Cardiff University experiments were inhumane and unnecessary for human health.
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