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A vestigial response or vestigial reflex in a species is a response that has lost its original function. In humans, vestigial responses include ear perking, ...
Goose bumps are an example of a vestigial human reaction to stress. The formation of goose bumps in humans under stress is a vestigial reflex; a possible function in the distant evolutionary ancestors of humanity was to raise the body's hair, making the ancestor appear larger and scaring off predators.
Humans also bear some vestigial behaviors and reflexes. The formation of goose bumps in humans under stress is a vestigial reflex; [31] its function in human ancestors was to raise the body's hair, making the ancestor appear larger
Human ear muscles that scientists long believed were vestigial are actually activated when we are trying to listen hard, a new study has found. As humans grew more proficient with visual and vocal ...
The formation of goose bumps in humans under stress is considered by some to be a vestigial reflex, [4] though visible piloerection is associated with changes in skin temperature in humans. [5] The reflex of producing goose bumps is known as piloerection or the pilomotor reflex, or, more traditionally, [6] horripilation.
The postauricular reflex is a vestigial myogenic [5] muscle response in humans that acts to pull the ear upward and backward. [6] Research suggests neural circuits for auricle orienting have survived in a vestigial state for over 25 million years. It is often assumed the reflex is a vestigial Preyer reflex (also known as the pinna reflex). [7] [8]
The grasp reflex also allows young individuals to have more developed food manipulation and dexterity skills. This suggests that the grasping reflex is vestigial in humans and in other non-fur carrying primates. [11] The reflex is also suggested to create a basis for which the voluntary grasping action originates.
In Jerry Coynes book Why Evolution is True he speaks of a babies grasp being an evolutionary vestigial reflex. An excerpt: “The final example from humans takes us into the realm of speculation, but is too appealing to omit. This is the “grasping reflex” of newborn babies. If you have access to an infant, gently stroke the palms of its hands.