Method Constant Stimulus
Method Constant Stimulus - Related Videos
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.
12:38
Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction
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Cited by 29 •
2018
A detailed protocol to perform a titration ELISA is described. Moreover, a novel algorithm is presented to evaluate titration ELISAs and to obtain a dissociation constant of binding of a soluble ligand to a microtiter plate-immobilized receptor.
11:23
Material Constants
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA In contrast to the production of cars or toasters, where millions of identical copies are made and extensive prototype testing is possible, each civil engineering structure is unique and very expensive to reproduce (Fig.1). Therefore, civil engineers must extensively rely on analytical modeling to design their structures. These models are simplified abstractions of reality and are used to...
07:28
A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli
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Cited by 6 •
2016
This article describes a technique for applying vibrotactile stimuli to the thigh of a human participant, and measuring the accuracy and reaction time of the participant's volitional response for various combinations of stimulation location and frequency.
09:03
Spectrophotometric Determination of an Equilibrium Constant
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2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology The equilibrium constant, K, for a chemical system is the ratio of product concentrations to reactant concentrations at equilibrium, each raised to the power of their respective stoichiometric coefficients. Measurement of K involves determination of these concentrations for systems in chemical equilibrium. Reaction systems containing a single colored component can be studied spectrophotometrically. The relation between...
FAQs
Randomizing the order reduces the chance that responses reflect a predictable sequence rather than sensory processing. Repeating every intensity also makes it possible to estimate response proportions from multiple observations instead of relying on a single judgment. This design helps reveal how consistently participants respond across the stimulus range and supports a more stable psychometric function.
The threshold depends on a predefined response criterion applied to the psychometric function. For example, a researcher may identify the intensity associated with 50% detection or another specified response level. Stating the criterion is essential because changing it changes the reported threshold, even when the underlying pattern of responses remains the same.
For an absolute threshold, responses indicate whether a stimulus is detected at different intensities. For a difference threshold, responses indicate whether a participant correctly discriminates between stimuli or stimulus levels. The same response-proportion approach can describe either task, but the interpretation changes from sensitivity to stimulus presence to sensitivity to a difference.
Response variability shows that perception does not always change at one perfectly sharp intensity. Participants may detect or discriminate some presentations at one level and respond differently on others. Examining the full response pattern therefore provides more information than a single cutoff, including how gradually performance changes and how sensory performance differs across conditions or populations.
First, select a fixed range of stimulus intensities relevant to the sensory question. Present those intensities repeatedly in randomized trials, record each detection or discrimination response, and calculate the response proportion for every level. Plotting those proportions produces a psychometric function, from which the researcher estimates the threshold using the chosen response criterion.
This method is useful when researchers need precise estimates of sensory sensitivity rather than a simple indication that one stimulus was noticed. It supports studies of absolute thresholds, difference thresholds, and perceptual discrimination. Because it samples multiple levels, investigators can compare sensory performance across experimental conditions or populations while also examining response variability.