resting tremor

a trembling that occurs when the affected body part is at rest. It is a characteristic symptom of Parkinson’s disease, in which case it sometimes is referred to as a parkinsonian tremor. The term parkinsonian tremor, however, more properly denotes any tremor associated with Parkinson’s disease, whether a resting tremor or an action tremor.

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Psychology term of the day

November 19th 2024

summation effect

a feature of binocular cells in the visual cortex in which the activity of the cell is greater when stimulation occurs through both eyes than when stimulation occurs through one eye. A similar phenomenon occurs in the auditory system; when both ears are stimulated, there is a binaural summation effect of enhanced loudness.