`reflex` Related Article Results

Many of us believe that instincts underlie our behaviors. But what if this is a profound misconception about human nature? While animals possess species-specific and unchanging instincts that ensure survival and species continuity, humans may lack such a mechanism altogether. Could it be instead that what guides humans is not instinct, but a complex interplay of consciousness, learning, and cultural codes? In this article, we uncover a counterintuitive truth about human nature: Do humans truly h

Lazarus reflex, is a rare, complex spinal reflex movement observed in patients diagnosed with brain death. This phenomenon is characterized by motor movements in which the patient raises their arms and crosses them over the chest. It occurs due to the persistence of neural activity in the spinal cord despite irreversible loss of brainstem function. History and Definition The Lazarus reflex was first described in the medical literature in 1984 by Ropper. The term is derived from the biblical figu

Pupil (Pupilla) is a natural opening located at the center of the iris that regulates the amount of light entering the eye. In normal adult individuals, pupil diameter typically ranges between 3.9 and 4.2 mm but exhibits a dynamic structure influenced by age, ambient lighting conditions, and the eye’s focusing state (accommodation). Neurophysiological Mechanism and Light Reflex The pupillary light reflex is a response of retinal photoreceptors and melanopsin-containing ganglion cells to light st