Arousal Thresholds
Arousal Thresholds - Related Videos
11:52
Misattribution of Arousal and Cognitive Dissonance
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2023
Source: Peter Mende-Siedlecki & Jay Van Bavel—New York University A host of research in psychology suggests that feelings of psychological arousal may be relatively ambiguous, and under certain circumstances, can lead us to make inaccurate conclusions about our own mental states. Much of this work flows from seminal research conducted by Stanley Schacter and and Jerome Singer. If someone experiences arousal and does not have an obvious, appropriate explanation, they may attempt to explain...
01:30
States of Arousal During Infancy
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2026
States of arousal describe an infant’s physiological and behavioral condition during sleep, wakefulness, and activity. These states are regulated by the circadian rhythm, an internal biological clock that organizes daily patterns of rest and alertness. During infancy, arousal is commonly classified into five states: regular sleep, irregular sleep, drowsiness, alert inactivity, and waking activity.Regular and Irregular SleepDuring regular sleep, an infant’s eyes remain closed, breathing is slow...
01:23
Optimal Arousal Theory
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2025
The optimal arousal theory suggests that performance is maximized when an individual experiences a moderate level of arousal. This theory is closely tied to the Yerkes-Dodson law, which illustrates an inverted U-shaped relationship between arousal and performance. The law, formulated by psychologists Robert Yerkes and John Dodson, implies an ideal arousal level for optimal performance, and deviations from this level can lead to declines in effectiveness. Inverted U-Shaped Performance Curve The...
06:48
The Staircase Procedure for Finding a Perceptual Threshold
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Psychophysics is the name for a set of methods in perceptual psychology designed in order to relate the actual intensity of stimuli to their perceptual intensity. One important aspect of psychophysics involves the measurement of perceptual thresholds: How bright does a light need to be for a person to be able to detect it? How little pressure applied to the skin is detectable? How soft can a sound be and still be heard? Put...
05:45
Rapid Determination of the Thermal Nociceptive Threshold in Diabetic Rats
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Cited by 10 •
2012
Here, we describe a rapid reliable and simple procedure to determine the lowest temperature at which rats or mice show nocifensive behavior, i.e. the thermal nociceptive threshold (TNT). This method applies a slowly increasing thermal stimulus allowing precise and reproducible estimation of TNTs with minimum, if any, stress to the animals.
FAQs
The brainstem reticular activating system contributes to regulating alertness by coordinating activity across neural circuits, while acetylcholine and norepinephrine alter circuit excitability. Their interaction helps determine whether incoming sensory information produces a detectable cortical or behavioral response. This mechanism allows responsiveness to change with internal state rather than remaining fixed across all situations.
Sleep stage, attention, stress, fatigue, and individual physiology can all shift arousal thresholds. A stimulus that produces a response during one state may fail to do so during another because neural excitability and signal prioritization have changed. Studying these influences helps distinguish state-dependent changes in responsiveness from more stable differences among individuals.
Cortical and behavioral responses represent different levels of nervous-system activation, so they do not necessarily change together. Neural activity may be measurable even when it does not produce an overt response, particularly when responsiveness is altered by sleep, fatigue, or other state variables. Comparing both outcomes gives a broader view of how the brain processes stimulation.
Researchers compare responses to sensory or internal stimulation under defined states such as different sleep stages, levels of attention, or conditions involving stress and fatigue. They assess whether stimulation produces measurable cortical or behavioral changes, then examine how the response pattern shifts between states. This approach reveals state-related changes in neural responsiveness without treating arousal as constant.
Measurements can show how responsiveness changes as the nervous system moves between sleep and wakefulness. Comparing cortical or behavioral reactions across sleep stages helps researchers examine when signals are more likely to reach measurable awareness-related processing. These observations support investigations of the neural regulation of alertness and the changing relationship between stimulation and responsiveness.
Arousal thresholds provide a way to study whether sensory or internal signals produce measurable neural or behavioral effects. In consciousness and attention research, this helps characterize how the brain selects or prioritizes signals. In neurological conditions that alter responsiveness, threshold changes can offer information about disrupted regulation of alertness and neural excitability.