According to individual needs theories, there is no single ideal amount of sleep, because genetics, age, health, activity level and even life circumstances influence how much sleep someone needs.
—
Chas Newkey-Burden,
TheWeek,
31 July 2026
The idea of functionalism was Putnam’s response to the fashionable theories of the time about how to understand mental states, such as thoughts, feelings, judgments, and beliefs.
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