Kittens raised in environments where they were only exposed to vertical stimuli (i.e., vertical stripes) had visual receptor cells that would only fire in response to vertical stimuli. Stimuli with other orientations evoked no response. This research was discussed as a demonstration of the importance of:

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This research highlights the concept of critical periods, which are specific times in development when the nervous system is particularly sensitive to certain environmental stimuli. The kittens' visual systems adapted to the stimuli they were exposed to during this critical period, demonstrating the importance of early experiences in shaping sensory development.

Kittens Raised in Environments Where They Were Only Exposed to Vertical