Current Search: Signal detection Psychology (x)
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- Title
- TRIAL-BY-TRIAL VS. BLOCK METHODS OF CUING AUDITORY SIGNAL PROBABILITIES WITH NAIVE SUBJECTS.
- Creator
- MORRIS, CHARLES D., Florida Atlantic University
- Abstract/Description
-
Twenty-four naive human Ss were run in an auditory signal detection task examining two hypotheses. 1) Naive Ss can produce data consistent with the theoretical assumptions of normality and equal variance of the underlying distributions. ROC curves on double-probability paper were found to be generally supportive of these assumptions as indicated by their linearity and slope. 2) The "trial-by-trial" method more evenly distributes the effect of nonsensory variables, providing less variable...
Show moreTwenty-four naive human Ss were run in an auditory signal detection task examining two hypotheses. 1) Naive Ss can produce data consistent with the theoretical assumptions of normality and equal variance of the underlying distributions. ROC curves on double-probability paper were found to be generally supportive of these assumptions as indicated by their linearity and slope. 2) The "trial-by-trial" method more evenly distributes the effect of nonsensory variables, providing less variable estimates of d' and S than does the "block" method. No differences were found in mean d' values although the "trial-by-trial" method produced less variable estimates. The ''block" method produced somewhat better orderings of individual, but not mean, beta values across probability levels. It is concluded that further use of naive Ss in signal detection paradigms permissible and that the "trial-by-trial" method is preferable for obtaining stable estimates of d', but not for obtaining appropriate orderings of beta.
Show less - Date Issued
- 1973
- PURL
- http://purl.flvc.org/fcla/dt/13594
- Subject Headings
- Auditory perception, Signal detection (Psychology)
- Format
- Document (PDF)
- Title
- Alternation of primary task stimulus modality affects event-related brain potentials and secondary task signal detection performance.
- Creator
- Bachanas, Pamela Jane., Florida Atlantic University, Nash, Allan J.
- Abstract/Description
-
The effect of alternating primary task stimulus modality on event-related brain potentials and secondary signal detection performance was examined in a dual-task paradigm. An odd-ball paradigm with alternating pairs of auditory tones and visual lights was employed as the primary counting task. Primary task stimuli were classified by previous trial modality (same vs different), previous trial stimulus type (standard vs deviant), and current trial stimulus type. A signal detection task in which...
Show moreThe effect of alternating primary task stimulus modality on event-related brain potentials and secondary signal detection performance was examined in a dual-task paradigm. An odd-ball paradigm with alternating pairs of auditory tones and visual lights was employed as the primary counting task. Primary task stimuli were classified by previous trial modality (same vs different), previous trial stimulus type (standard vs deviant), and current trial stimulus type. A signal detection task in which an auditory tone followed the primary task stimuli by 120 ms on 50 percent of the trials served as the secondary task. For all but one condition, deviant stimuli produced large P300 and decreased signal detection performance. When a deviant stimulus preceded a deviant in the same modality, however, signal detection performance was better than on standard trials preceded by a deviant. These results were interpreted using a two-parameter model of stimulus probability and subjective value of the stimulus sequence. Also examined were other effects of alternating modality of the primary task stimulus and the sequences defined by the modality and stimulus type of the current and previous trial on the event-related potentials elicited by the primary task stimuli.
Show less - Date Issued
- 1989
- PURL
- http://purl.flvc.org/fcla/dt/14507
- Subject Headings
- Evoked potentials (Electrophysiology), Signal detection (Psychology)
- Format
- Document (PDF)
- Title
- THE RELATIONSHIP BETWEEN P300 ELICITED DURING A PRIMARY TASK AND PERFORMANCE ON A NEAR-SIMULTANEOUS SECONDARY SIGNAL DETECTION TASK.
- Creator
- PINEDA, JAIME ARMANDO., Florida Atlantic University
- Abstract/Description
-
The relationship between P300 elicited on a primary counting task and performance on a secondary signal detection task was studied in a dual task paradigm where the secondary task followed the primary task by 300 msec. A modified ("count both tones") oddball paradigm, utilizing two auditory tones (Frequent and Rare) was used as the primary counting task to elicit two states characterized by differences in P300 amplitudes. An auditory signal detection task presented on 50 percent of the trials...
Show moreThe relationship between P300 elicited on a primary counting task and performance on a secondary signal detection task was studied in a dual task paradigm where the secondary task followed the primary task by 300 msec. A modified ("count both tones") oddball paradigm, utilizing two auditory tones (Frequent and Rare) was used as the primary counting task to elicit two states characterized by differences in P300 amplitudes. An auditory signal detection task presented on 50 percent of the trials following the primary task tones served as the secondary task. Predictions about performance on the secondary task were based on a neural inhibition model of P300. It was hypothesized that signal detection performance, as measured by detection sensitivity (d') would be less on Rare tone trials than on Frequent tone trials. Results were consistent with the hypothesis and provided support for the neural inhibition model of the P300.
Show less - Date Issued
- 1982
- PURL
- http://purl.flvc.org/fcla/dt/14133
- Subject Headings
- Evoked potentials (Electrophysiology), Signal detection (Psychology)
- Format
- Document (PDF)
- Title
- THE EFFECT OF DUAL-TASK ON THE HUMAN EVOKED POTENTIAL ELICITED ON A PRIMARY TASK AND PERFORMANCE ON A NEAR-SIMULTANEOUS SECONDARY SIGNAL DETECTION TASK.
- Creator
- ODIERNA, LISA ANN., Florida Atlantic University
- Abstract/Description
-
The relationship between P300 elicited on a primary counting task and performance on a secondary signal detection task was examined in a dual-task paradigm in which the secondary task followed the primary task by 120 ms. An odd-ball paradigm, utilizing two auditory tones (Standard and Deviant) was employed as the primary counting task in order to elicit two states characterized by differences in P300 amplitudes. The standard trials were further categorized according to their serial position...
Show moreThe relationship between P300 elicited on a primary counting task and performance on a secondary signal detection task was examined in a dual-task paradigm in which the secondary task followed the primary task by 120 ms. An odd-ball paradigm, utilizing two auditory tones (Standard and Deviant) was employed as the primary counting task in order to elicit two states characterized by differences in P300 amplitudes. The standard trials were further categorized according to their serial position in each series of trials. A signal detection task in which an auditory tone followed the primary task tones on 50 percent of the trials served as the secondary task. The principal hypothesis was that a decrease in sensitivity on secondary signal detection task accompanied Deviant trials in which a P300 was elicited. Results were consistent with the hypothesis and provided support for both neural inhibition and cognitive resource allocation models.
Show less - Date Issued
- 1987
- PURL
- http://purl.flvc.org/fcla/dt/14352
- Subject Headings
- Signal detection (Psychology), Evoked potentials (Electrophysiology)
- Format
- Document (PDF)
- Title
- The effects of standard and deviant tones on event-related brain potentials and reaction-times to visual stimuli.
- Creator
- Fernandez, Mercedes, Florida Atlantic University, Nash, Allan J.
- Abstract/Description
-
This research investigated whether choice reaction time (RT) measures and the P300 component of the event-related brain potential (ERP) could be employed to index the attentional resources associated with performing two near-simultaneous tasks. Specifically, this study investigated the effects of auditory tones on the ERPs and RTs associated with a visual stimulus when the stimuli in both modalities were presented in close temporal proximity. The hypothesis that the ERPs and RTs elicited by...
Show moreThis research investigated whether choice reaction time (RT) measures and the P300 component of the event-related brain potential (ERP) could be employed to index the attentional resources associated with performing two near-simultaneous tasks. Specifically, this study investigated the effects of auditory tones on the ERPs and RTs associated with a visual stimulus when the stimuli in both modalities were presented in close temporal proximity. The hypothesis that the ERPs and RTs elicited by the deviant visual stimulus would index the processing demands associated with the auditory modality was confirmed. In general, greater P300 amplitude associated with one task indicates diminished P300 and poorer performance on a second task. The results indicate that P300 may be a sensitive indicator of shared processing resources when two tasks are performed near simultaneously.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/15122
- Subject Headings
- Selectivity (Psychology), Evoked potentials (Electrophysiology), Visual perception, Signal detection (Psychology)
- Format
- Document (PDF)