Perceptual Discrimination Task
Perceptual Discrimination Task - Related Videos
11:16
The Dig Task: A Simple Scent Discrimination Reveals Deficits Following Frontal Brain Damage
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Cited by 14 •
2013
In this protocol, a novel application of scent discrimination is described. The Dig task is a reasonably inexpensive task that can be used to assess frontally-mediated cognition following brain damage.
07:34
Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Cited by 25 •
2013
Investigation of the Uncanny Valley Hypothesis and affective experience requires an understanding of the hypothesis' dimension of human likeness (DHL). This protocol allows representation of the DHL and examination of categorical perception. Use of the same stimuli and fMRI to distinguish brain regions responsive to physical and category change is illustrated.
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...
10:45
Finding Your Blind Spot and Perceptual Filling-in
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In the back of everyone's eye is a small piece of neural tissue called the retina. The retina has photosensitive cells that respond to stimulation by light. The responses of these cells are sent into the brain through the optic nerve, a bundle of neural fibers. In each retina there is a place somewhere in the periphery where the outputs from retinal cells collect and the bundled optic nerve exits to the brain. At that location,...
02:55
Stereotypes, Prejudice, and Discrimination
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2020
Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who are...
FAQs
Stimulus similarity determines how finely the task can probe sensory discrimination. By varying the difference between items along one defined feature, such as intensity, color, shape, sound, or texture, researchers can observe performance across levels of similarity and derive a discrimination threshold. This design links perceptual sensitivity to measurable behavioral responses.
Presentation conditions and task demands shape what a response reflects. Changing how stimuli are presented or asking participants to identify, classify, or judge same versus different can emphasize distinct aspects of performance. Comparing accuracy and reaction time under these conditions helps show how task demands relate to behavioral performance.
Accuracy, reaction time, and discrimination thresholds provide complementary outcomes rather than interchangeable measures. Accuracy indicates whether responses are correct, reaction time captures how quickly a judgment is made, and the threshold summarizes performance as stimulus differences change. Considering these measures together gives a broader account of sensory processing and behavioral performance.
To structure a trial, researchers present two or more stimuli that differ along a selected feature, then record the participant’s response. The response may require identification, classification, or a same-different judgment. Repeating this arrangement while manipulating stimulus similarity, presentation conditions, or task demands produces data for comparing performance across controlled conditions.
The task supports broader studies of perception and behavior because its measures can be collected while researchers examine learning, attention, or memory. It is also useful for tracking changes associated with development, training, or an experimental intervention. In each case, performance measures provide behavioral evidence about how sensory discrimination relates to the process under study.
A change in accuracy, reaction time, or discrimination threshold can be evaluated alongside the manipulated stimulus feature, presentation condition, or task demand. In behavior studies, this comparison helps characterize how sensory processing varies with learning, attention, memory, development, training, or intervention, while keeping the interpretation tied to measured task performance.