scholarly journals Stimulus presentation frequency in brightness discrimination and generalization: A test of adaptation-level and signal-detection interpretations

1985 ◽  
Vol 37 (3) ◽  
pp. 243-248 ◽  
Author(s):  
David R. Thomas ◽  
Bradley T. Windell ◽  
Jon L. Williams ◽  
K. Geoffrey White
Keyword(s):  
Signal Detection ◽  
Brightness Discrimination ◽  
Stimulus Presentation ◽  
Adaptation Level ◽  
Presentation Frequency

Investigation of the mirrored-word reading paradigm for BCI implementation

2019 ◽  
Vol 64 (3) ◽  
pp. 325-337
Author(s):  
Randy E.S. Harnarinesingh ◽  
Chanan S. Syan
Keyword(s):  
Word Reading ◽  
Stimulus Presentation ◽  
Visual Presentation ◽  
Computer Interface ◽  
The Novel ◽  
Single Trial ◽  
Presentation Frequency ◽  
Multiple Trials ◽  
Online Format ◽  
Future Work

Abstract Brain-computer interface (BCI) applications such as keyboard control and vehicular navigation present significant assistive merit for disabled individuals. However, there are limitations associated with BCI paradigms which restrict a wider adoption of BCI technology. For example, rapid serial visual presentation (RSVP) paradigms can induce seizures in photosensitive epileptic subjects. This paper evaluates the novel mirrored-word reading paradigm (MWRP) for BCI implementation using an offline experimental study. The offline study obtained an average single-trial classification accuracy of 74.10%. The results also demonstrate that the use of multiple trials for classification can increase the accuracy as is common with BCIs. The developed MWRP-based BCI also utilized a low presentation frequency which averts the possibility of paradigm induced photosensitivity. However, there are multiple avenues for future work. The MWRP can be implemented in the online format for real-time device control. For example, a vehicular application platform can be used where the word orientation represents directions for travel. The MWRP can also be investigated across a wider range of stimulus presentation parameters such as timing, color and stimulus size. Such studies can be used to suggest further improvements to the paradigm which can enhance its applicability for online device control.

scholarly journals STIMULUS PRESENTATION RATIOS AND THE OUTCOMES FOR CORRECT RESPONSES IN SIGNAL-DETECTION PROCEDURES

1999 ◽  
Vol 72 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Victoria Johnstone ◽  
Brent Alsop
Keyword(s):  
Signal Detection ◽  
Stimulus Presentation

Can Face Recognition Really be Dissociated from Object Recognition?

1999 ◽  
Vol 11 (4) ◽  
pp. 349-370 ◽  
Author(s):  
Isabel Gauthier ◽  
Marlene Behrmann ◽  
Michael J. Tarr
Keyword(s):  
Face Recognition ◽  
Object Recognition ◽  
Signal Detection ◽  
Response Times ◽  
Stimulus Presentation ◽  
Error Rates ◽  
Match To Sample ◽  
Neuropsychological Evidence ◽  
Different Levels ◽  
Normal Controls

We argue that the current literature on prosopagnosia fails to demonstrate unequivocal evidence for a disproportionate impairment for faces as compared to nonface objects. Two prosopagnosic subjects were tested for the discrimination of objects from several categories (face as well as nonface) at different levels of categorization (basic, subordinate, and exemplar levels). Several dependent measures were obtained including accuracy, signal detection measures, and response times. The results from Experiments 1 to 4 demonstrate that, in simultaneous-matching tasks, response times may reveal impairments with nonface objects in subjects whose error rates only indicate a face deficit. The results from Experiments 5 and 6 show that, given limited stimulus presentation times for face and nonface objects, the same subjects may demonstrate a deªcit for both stimulus categories in sensitivity. In Experiments 7, 8 and 9, a match-to-sample task that places greater demands on memory led to comparable recognition sensitivity with both face and nonface objects. Regardless of object category, the prosopagnosic subjects were more affected by manipulations of the level of categorization than normal controls. This result raises questions regarding neuropsychological evidence for the modularity of face recognition, as well as its theoretical and methodological foundations.

Residual Sensory Capacities of the Deaf: A Signal Detection Analysis of a Visual Discrimination Task

1979 ◽  
Vol 48 (1) ◽  
pp. 187-194 ◽  
Author(s):  
Michael Bross
Keyword(s):  
Signal Detection ◽  
Discrimination Task ◽  
Brightness Discrimination ◽  
Deaf Children ◽  
Stimulus Probability ◽  
Sensory Sensitivity ◽  
Detection Analysis ◽  
Brightness Discrimination Task ◽  
Signal Detection Analysis ◽  
Compensation Hypothesis

This experiment compared the visual sensory sensitivity of deaf and hearing subjects in a signal detection paradigm. Subjects ( ns:= 6) were required to give forced-choice responses to a brightness discrimination task under three stimulus probability conditions (0.25, 0.50, and 0.75). A total of 1,800 trials were given to each subject and utilized to construct isosensitivity functions and d' and Beta, indices for sensory sensitivity and response bias, respectively. The results showed that no enhanced sensory sensitivity is present for these deaf children and questions the classical sensory compensation hypothesis. Furthermore, the deaf subjects responded in a relatively bias-free manner to variations in stimulus probability.

Adaptation-Level Theory

1974 ◽  
Vol 19 (11) ◽  
pp. 773-774
Author(s):  
JACOB BECK
Keyword(s):  
Adaptation Level ◽  
Adaptation Level Theory

Can patients with obsessive-compulsive disorder discriminate between percepts and mental images? A signal detection analysis.

1994 ◽  
Vol 103 (3) ◽  
pp. 445-454 ◽  
Author(s):  
Halle D. Brown ◽  
Stephen M. Kosslyn ◽  
Hans C. Breiter ◽  
Lee Baer ◽  
Michael A. Jenike
Keyword(s):  
Signal Detection ◽  
Obsessive Compulsive Disorder ◽  
Mental Images ◽  
Obsessive Compulsive ◽  
Compulsive Disorder ◽  
Detection Analysis ◽  
Signal Detection Analysis
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