Introduction to the Flexion Reflex The flexion reflex, commonly referred to as the withdrawal reflex, represents one of the most fundamental and evolutionarily ancient protective mechanisms embedded within the central nervous system of multicellular organisms. At its biological core, this reflex is characterized by an involuntary, rapid, and highly coordinated withdrawal of a limb or […]
Introduction to the Startle Reaction (Pattern) The startle reaction, fundamentally recognized as the startle pattern, is a rapid and involuntary physiological response elicited by sudden, intense, or unexpected stimuli. This reflex is universally observed across the animal kingdom, underscoring its role as a primitive defense mechanism vital for survival. The reaction is characterized by an […]
Introduction and Definition of Prepulse Inhibition (PPI) Prepulse Inhibition, commonly abbreviated as PPI, constitutes a fundamental neurophysiological phenomenon characterized by the diminution of a reflex response when a weak, non-startling stimulus precedes a subsequent strong, startling stimulus. This mechanism is crucial for filtering sensory information and preventing sensory overload, effectively representing a form of neural […]