An Investigation of Attentional and Inhibitory Processes During Active Visual Search in Humans
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In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Contour Search Task, Stop signal Task, Useful field of View, Attentional capture search task.
- Who it may be relevant to
- Registry conditions: Eye Movements, Attention, Executive Function. Basic parameters: 18 years — 65 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- United States
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Contributions of Attentional and Inhibitory Functioning to Saccadic Decisions
Overview
The goal of this study is to investigate the finding that there are large individual differences in how participants move their eyes during active visual search. For example, some individuals tend to fixate, that is point their eyes steadily at a single location, for longer than other individuals before moving to another location. This experiment will use behavioral tasks to measure an individual's attentional and inhibitory functioning, and then see how each of these contributes to between-participant variability in eye movement behavior during visual search.
Detailed description
To accomplish the goal of understanding the source of individual variability in eye movement patterns, each participant will complete three separate tasks. The first task will require participants to find a target and eye movements will be measured to assess individual differences in fixation duration and other types of eye movement behavior. A second task will evaluate attentional functioning over the visual field by requiring participants to detect briefly-presented targets using their peripheral vision. Finally, a third task will assess inhibitory functioning by having participants attempt to stop eye movements after they have been programmed.
Interventions
- Other Contour Search Task
In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. For the visual search task, participants will search for a visual target among distractors and make a response regarding its orientation. The target is defined by a contour formed through oriented Gabor patches. - Behavioral Stop signal Task
In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. For the stop-signal task, participants will make an eye movement to a target that appears on the screen, except on trials where a visual signal appears indicating they should cancel this behavior. - Behavioral Useful field of View
In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. In the useful field of view task, participants will report the location of a briefly-presented and masked target, while also responding to the identify of a central target in some blocks. - Behavioral Attentional capture search task
In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. For this visual search task, participants will search for a visual target among distractors and make a response regarding its orientation. The target is defined as a unique shape, and is sometimes shown with a salient distractor.
Primary outcome measures
- First fixation duration during visual search [Time frame: During visual search task]
- Fixation count during visual search [Time frame: During visual search task]
- Stop signal reaction time [Time frame: During inhibitory task]
- Useful field of view thresholding [Time frame: During attention task]
- Useful field of view dual task performance [Time frame: During attention task]
- Oculomotor capture by salient distractor [Time frame: During visual search task]
Secondary outcome measures (1)
- Average fixation duration during visual search [Time frame: During the visual search task]
Eligibility criteria
Inclusion criteria
- 18-65 years old
Exclusion criteria
- Self-reported history of neurological illness
- Uncorrected vision problems
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Allocation
- Randomized
- Model
- Parallel assignment
- Masking
- Open label
- Primary purpose
- Basic science
Study locations
United States · 1 center
- University of Colorado Denver — Denver
Identifiers
NCT: NCT06587113 · 22-1148 · R15EY035056-01