No human participants were required as part of the computational modelling for this experiment during the period of this project. No participants were recruited and no data was collected.

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.

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.

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

Only de-identified behavioral data will be shared with other investigators upon request.

Data will be shared after all analyses and modeling of the data are complete and manuscripts resulting from the research are accepted for publication.

We will share data with investigators who request (after research using the data are complete).

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.