Definition and Fundamental Function The excitatory synapse represents the fundamental unit of information flow within the central nervous system, serving as the primary mechanism by which one neuron compels a subsequent neuron toward firing an action potential. It is defined precisely as a chemical junction where the arrival of an action potential at the presynaptic […]
Introduction to Neural Irritability Neural irritability, often termed neuronal excitability, is a fundamental property defining the responsiveness of a neuron to incoming stimuli. It precisely dictates the likelihood or probability of a neuron generating an action potential (AP) when exposed to a specific change in its environment, whether chemical or electrical. This critical physiological measure […]
Definition and Context of Posttetanic Potentiation Posttetanic Potentiation, universally abbreviated as PTP, represents a highly specific form of short-term synaptic plasticity observed across various neural circuits. Fundamentally, PTP is defined as the pronounced, transient increase in the efficacy of synaptic transmission following a brief, high-frequency train of electrical impulses, known as a tetanus, delivered to […]
EXCITATORY POSTSYNAPTIC POTENTIAL (EPSP) The Core Definition of EPSP The Excitatory Postsynaptic Potential (EPSP) represents a transient depolarization of the postsynaptic neuron membrane caused by the influx of positively charged ions. In its simplest form, an EPSP is a graded electrical potential that occurs when an excitatory neurotransmitter is released from the presynaptic terminal, binding […]
Excitatory Threshold: The Gateway to Neuronal Communication The Core Definition of Excitatory Threshold The excitatory threshold is a fundamental concept in neuroscience, representing the critical level of membrane potential that a neuron must reach at its axon hillock in order to generate an action potential. This threshold acts as a crucial physiological switch, determining whether […]
Spontaneous Neural Activity The Core Definition of Spontaneous Neural Activity Spontaneous neural activity refers to the intrinsic electrical firing of neurons in the brain that occurs without any immediate external stimulus. This phenomenon, often conceptualized through frameworks like neuronal avalanches, represents a fundamental and pervasive aspect of normal brain functioning, distinguishing the brain from a […]