Startle Potentiation
Startle Potentiation - Related Videos
08:38
Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
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Cited by 164 •
2011
Habituation and prepulse inhibition of startle are operational measures of sensory gating. Sensory gating is disrupted in schizophrenia, and some other mental disorders and neurodegenerative diseases. We here describe a standard protocol to assess short-term and long-term habituation as well as prepulse inhibition of acoustic startle responses in rats and mice.
07:58
Methods to Characterize Spontaneous and Startle-induced Locomotion in a Rotenone-induced Parkinson's Disease Model of Drosophila
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Cited by 10 •
2014
Parkinson’s disease is a neurodegenerative disorder that results from the degeneration of dopaminergic neurons in the central nervous system, causing locomotion defects. Rotenone models Parkinson’s disease in Drosophila. This paper outlines two assays that characterize both spontaneous and startle-induced locomotion deficiencies caused by rotenone.
06:25
Evaluating Toxicity of Chemicals using a Zebrafish Vibration Startle Response Screening System
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Cited by 6 •
2024
We describe a screening system's workflow and data analysis for evaluating chemical compound toxicity based on the zebrafish embryo vibration startle response. The system records the movements of zebrafish embryos upon exposure to a vibration stimulus and allows for an integrated evaluation of general toxicity/lethality and neuromuscular toxicity.
06:50
Electric Potential
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Electric potential, also known as "voltage", measures the electric potential energy per unit charge. Electric field is a scalar quantity and is fundamental to many electrical effects. Like potential energy, what is physically meaningful is the difference in the electric potential. For example, the spatial variation in the electric potential is related to the electric...
00:52
Potential Energy
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2019
The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy. Chemical bonds that form attractive forces between atoms also contain potential energy, called chemical energy. When a chemical reaction...
FAQs
Threat-processing circuits increase the influence of a threatening cue on brainstem motor pathways that generate the acoustic startle response. This interaction changes the magnitude of the reflex rather than replacing it with a separate response. Consequently, the measured reaction reflects both the basic reflex pathway and the level of defensive activation associated with the surrounding cue or context.
Pairing gives the previously neutral cue threat-related meaning. When the cue appears again, it can signal an expected aversive event and enhance defensive responding. The resulting change provides a behavioral readout of fear learning, because the response depends on how the subject processes the learned relationship between the cue and the aversive outcome.
The response becomes larger when a cue or context increases expectation of threat or produces greater arousal. This sensitivity allows Startle Potentiation to capture differences in defensive state, not merely whether a reflex occurred. Changes in threat expectation can therefore help reveal altered emotional processing associated with anxiety, stress, or other forms of psychopathology.
A typical sequence first establishes an association between a neutral cue and an aversive event. Researchers then present the cue together with a sudden acoustic stimulus and measure the resulting reflexive response. Comparing responses across cue-related and less threatening conditions shows whether learned threat information enhances startle magnitude.
Researchers use the paradigm when they need a behavioral measure of fear learning, anxiety, or emotional processing. Because the response changes with threat expectation, it can distinguish alterations in defensive responding that may not be evident from observing the cue alone. The method is therefore relevant to basic behavior research and investigations of psychopathology.
Researchers can examine whether stress or a pharmacological intervention changes the enhancement of the startle response in a threatening context. A reduced or increased response may indicate altered defensive activation or threat processing, depending on the study design. This makes the measure useful for testing treatment-related changes in emotional and defensive behavior.