Pure Tone Stimuli
Pure Tone Stimuli - Related Videos
10:41
Method to Measure Tone of Axial and Proximal Muscle
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Cited by 5 •
2011
We have developed a device (Twister) to study the regulation of tonic muscle activity during active postural maintenance. Twister measures torsional resistance and muscular responses in standing subjects during twisting of the body axis. The device can be flexibly configured to study various aspects of tonic control across the neck, trunk, and/or hips.
01:12
Alterations in Muscle Tone ll
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2026
Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
12:12
Irrelevant Stimuli and Action Control: Analyzing the Influence of Ignored Stimuli via the Distractor-Response Binding Paradigm
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Cited by 4 •
2014
The distractor-response binding paradigm is described. It can be used to shed light on the influence irrelevant stimuli, competing with targets for a response, can have on human action. Both response retrieval effects and distractor inhibition effects can be analyzed within the paradigm.
02:08
Generating Pure Bacterial Cultures in a Liquid Medium
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2025
Source: Brumfield, K. D. et. al., Laboratory Techniques Used to Maintain and Differentiate Biotypes of Vibrio cholerae Clinical and Environmental Isolates. J. Vis. Exp. (2017)This video demonstrates the growth of bacterial cultures in a liquid medium. Shaking promotes aeration and distributes nutrients evenly, supporting exponential growth and resulting in a uniform, metabolically active suspension suitable for downstream applications.
01:11
Alterations in Muscle Tone lll
0 Views •
2026
Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
FAQs
Testing multiple frequencies shows whether hearing sensitivity remains consistent across the audible range or changes at particular frequencies. Because frequency and intensity can be adjusted independently, clinicians or researchers can examine responses to distinct frequency conditions without simultaneously changing signal strength. This frequency-by-frequency information contributes to hearing-threshold measurements in pure-tone audiometry.
Independent control separates two different properties of the acoustic stimulus: frequency and intensity. A response can therefore be evaluated under a selected frequency while the signal level is varied to determine the lowest detectable intensity. This separation helps produce interpretable thresholds and prevents changes in one stimulus property from being confused with changes in the other.
The sinusoidal waveform provides a controlled pattern of pressure change for examining auditory responses. Since the signal contains one frequency, it avoids the added frequency components present in more complex sounds. That focused structure makes pure tone stimuli useful when researchers need to relate an auditory response or threshold to a specific frequency condition.
In pure-tone audiometry, thresholds are measured across frequencies and used to help identify conductive, sensorineural, or mixed hearing loss. The value of the test lies in its systematic measurement of hearing sensitivity rather than in a single sound response. These results provide clinically relevant information about the presence and classification of hearing impairment.
An electronic system generates the stimulus, a clinician or researcher selects its frequency and intensity, and the signal is delivered through headphones, insert earphones, or speakers. Responses are then used to determine hearing thresholds across frequencies. Repeating this controlled process across selected conditions creates the measurements needed for audiometric assessment.
They support several research and clinical activities, including auditory research and hearing-aid evaluation. Their adjustable frequency and intensity allow investigators to examine responses under controlled acoustic conditions, while the same type of stimulus can help assess how hearing-aid users respond during evaluation. Thus, the technique extends from measurement of hearing sensitivity to device-related investigation.
Threshold measurements obtained with pure tone stimuli can be compared over time to monitor changes associated with disease, aging, medication, or noise exposure. Using controlled frequencies and intensities makes the testing conditions suitable for tracking shifts in auditory sensitivity. In medicine, this supports observation of hearing status as a condition or exposure changes.