Waist-to-Hip Ratio

Principle

Preference for certain body ratios tied to attraction. • Men prefer ~0.70 in women; women prefer ~0.90 in men. • Reflects evolutionary cues of health and fertility. • Applied in media, advertising, and avatar design.

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Fitts' Law

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Interference Effects

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Uncertainty Principle

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Performance Load

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Serial Position Effects

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Legibility

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