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NCT07572630

Probing the Role of Feature Dimension Maps in Visual Cognition: Impact of Task Demands and Spatial Attention (Expt 2.2)

Enrolling by Invitation
NAAges 18–55InterventionalBasic science
University of California, Santa Barbara
~12 participants
Updated 2026-05-07 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
Strength of stimulus representation quantified by map activation at stimulus location(s) derived from multivariate analysis of functional MRI data
Measured over During each fMRI scanning session throughout enrollment (sessions will be scheduled to occur within 1-2 weeks of enrollment).
+3 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

  • Strength of stimulus representation quantified by map activation at stimulus location(s) derived from multivariate analysis of functional MRI dataDuring each fMRI scanning session throughout enrollment (sessions will be scheduled to occur within 1-2 weeks of enrollment).

    Measurement of fMRI BOLD activation at stimulus location in reconstructed neural priority maps computed using spatial IEM in each retinotopic ROI (motion- and color-selective)

  • Discrimination accuracy derived from behavioral performance during fMRI scanning, acquired using fMRI button boxDuring each fMRI scanning session throughout enrollment (sessions will be scheduled to occur within 1-2 weeks of enrollment).

    Performance (% correct responses) at challenging discrimination tasks performed at fixation or stimulus location(s)

  • Response time derived from behavioral performance during fMRI scanning, acquired using fMRI button boxDuring each fMRI scanning session throughout enrollment (sessions will be scheduled to occur within 1-2 weeks of enrollment).

    Performance (time until response registered) when making challenging discrimination tasks

  • Discrimination thresholds derived from behavioral performance during fMRI scanning, acquired using fMRI button boxDuring each fMRI scanning session throughout enrollment (sessions will be scheduled to occur within 1-2 weeks of enrollment).

    Level of stimulus change necessary to equate behavioral performance across conditions, which is a measure of strength of information available to participants about attended feature/stimuli