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sour

adj. denoting the taste elicited by acids. Increasing sourness generally occurs with declining pH. Acids are involved in many physiological processes and also characterize unripe or spoiled foods; thus, their detection is essential for an organism’s ion homeostasis and food selection. —sourness n.

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Psychology term of the day

May 9th 2024

postural aftereffect

postural aftereffect

a change in posture that arises as an aftereffect of prior stimulation. For example, when viewing a moving scene, a person typically leans in the direction of the motion. When viewing ends, body posture returns to a vertical position and then, briefly, leans in the opposite direction.