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NCT06281457

Probing the Role of Feature Dimension Maps in Visual Cognition: Impact of Task Demands (Expt 2.1)

Enrolling by Invitation
NAAges 18–55InterventionalBasic science
University of California, Santa Barbara
~10 participants
Updated 2024-08-21 on ClinicalTrials.gov
What's tested:Stimulus properties: task-defining feature

At a glance

Recruiting sites
0 of 1 listed site is recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Blood Oxygenation Level Dependent (BOLD) fMRI signal
Measured over Through study completion, an average of two weeks
+2 more outcomes measured

Conditions

Basic Science: Visual Attention in Healthy Participants
Basic Science: Neural Representations of Location

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Healthy Volunteers

Where it's being run

1 sites across 1 states
California1

Study leadership

  • Tommy C Sprague · PRINCIPAL_INVESTIGATOR · University of California, Santa Barbara

Who to contact

This trial hasn't published a contact. View it on ClinicalTrials.gov

Do you actually qualify for this trial?

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Eligibility criteria

Inclusion

between 18 and 55 years of age
normal or corrected-to-normal vision

Exclusion

neurological disease based on self-report
implanted medical devices (e.g., cardiac pacemaker; metallic aneurism clip)
non-removable metallic piercings
metal fragments in the body (e.g., from welding)
pregnant and have a chance of being pregnant (if female)
history of claustrophobia
history of hearing loss/damage

What this trial measures

  • Blood Oxygenation Level Dependent (BOLD) fMRI signalThrough study completion, an average of two weeks

    The investigators will use BOLD activation patterns measured from each retinotopic ROI to fit quantitative models of spatial encoding. These models will be used to reconstruct stimulus representations on experimental trials to quantify how stimulus representations are encoded in each brain region studied, and how these representations change across experimental manipulations. These measurements will be used to test the impact of stimulus manipulations on stimulus representations in different brain regions.

  • Gaze positionThrough study completion, an average of two weeks

    The investigators will use the measured gaze position in (x,y) coordinates to verify stable fixation throughout the experiment. Trials with poor fixation performance may be excluded from further analyses.

  • Behavioral response (button press)Through study completion, an average of two weeks

    On attend-fixation trials, participants will be instructed to attend carefully to the fixation point and report the shape of a target '+' (wide or tall) by pressing one of two buttons held in their hand inside the scanner. The left button will indicate wide; the right button will indicate tall. On attend-color trials, participants will report whether more dots of the attended stimulus are orange (left button) or cyan (right button). On attend-motion trials, participants will report whether more of the dots of the attended stimulus are moving counterclockwise (left button) or clockwise (right button). The investigators will ensure participants are performing the task as instructed by assessing the accuracy of their behavioral responses.