Healthy
Conditions
Keywords
eye tracker, visual perception
Brief summary
Using a noninvasive eye tracker, the investigators will measure how participants move their eyes to objects arrayed on a computer screen. Participants will be asked to find one element among many.
Detailed description
The investigators measure how quickly and how accurately participants can move their eyes from a central fixation point to a target object arrayed with one or more distractor objects. A noninvasive eye tracker will be used to measure their eye movements. Participants may also be asked to make a decision about a feature of the target they have selected with a key press. Difficulty of the search for the target object and difficulty of the decision about a feature of the target object will be manipulated.
Interventions
BEHAVIORALTarget and Stimulus
The investigators manipulate the difficulty of search for the target object by manipulating the number of distractor objects and/or the similarity between the target and distractors. The investigators manipulate the difficulty of the decision about a feature by manipulating the similarity of the feature to a criterion. The investigators manipulate the timing of when the decision feature appears on the object relative to the onset of the array and/or the onset of the saccade away from fixation in a gaze-contingent manner.
Sponsors
Vanderbilt University
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
BASIC_SCIENCE
Masking
NONE
Masking description
Manipulation is within-participant. Participants view multiple visual search arrays in an experimental session. They will be masked with regards to the difficulty and timing manipulations until they experience them on a trial.
Intervention model description
Participants are asked to view an array of objects on a computer screen equipped with a noninvasive eye tracker. They are asked to search for a target object among one or more distractor objects and may be asked to respond to a feature of the target object with a key press that was selected via a gaze shift.
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
No
Inclusion criteria
* Sona System users (open to the public)
Exclusion criteria
* participants that fail the Ishihara color vision screening test * participants with acuity worse than 20/20 with or without correction * children under 18 * adults over 50
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Eye Tracking Data | During 1-2 hour experimental session | Saccade Events, Fixation Events, Pupil Size |
| Response Data | During 1-2 hour experimental session | Response Time, Error Rate |
Countries
United States
Outcome results
None listed