Visual Attention and Eye Movements

NCT03298737 | Enrolling By Invitation

• 1 other identifier: RSRB00068408
• Study Type: observational
• Target: 20
• Locations: 1 country
• Sites: 1

Brief Summary

The purpose of this study is to provide information about how the brain processes sensory inputs using visual stimuli throughout various psychophysical experiments.

Conditions

Vision, Ocular

Outcome Measures

Primary Outcomes (1)

• Pursuit eye movements to peripheral moving stimuli

  Pursuit eye movements are smooth eye movements with slow velocities (\< 15 degs/sec) that track the motion of visual stimuli when they are at the center of the visual field (Madelain and Krauzlis, J. of Vision, 2003). Here we will test the prediction that pursuit eye movements begin to track the motion of the stimulus located peripherally as an eye movement moves to the stimulus. The null hypothesis is that there will be no effect of the peripheral stimulus motion on the pursuit eye movements. We will measure eye movements using an infra-red eye tracker (Arrington, Inc) from 500 or more trials collected in each session. The distribution of pursuit eye movements will be computed for each subject to evaluate if there is significant pursuit along the direction of stimulus motion around the time of the saccade. The mean per participant will be determined and group effects evaluated.

  baseline

Study Arms (1)

Correct to normal vision population

Behavioral: Covert Spatial Attention

Interventions

Covert Spatial Attention BEHAVIORAL

During behavioral sessions, subjects will sit in a dark room and view a video monitor placed at the minimum of 57 cm distance away from the subject. Staff will be present throughout all the testing to assist the subject and monitor equipment that is used for tracking their eye position. Subjects will be asked to maintain their heads in a stable position of rest in order to insure accurate tracking of their eye position. To stabilize their head, subjects will either use a "chin rest" in which they position their chin on a soft pad mounted in front of a video screen, or they may use a "bite bar."

Correct to normal vision population

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

Healthy participants age 18-65 with corrected to normal vision

You may qualify if:

• Age between 18-65
• Corrected-to-normal vision
• No known diagnosis of visual or auditory disorder or impairment

You may not qualify if:

• Does not have corrected-to-normal vision
• Unable to understand and follow the instructions given of the study
• Known diagnosis of visual or auditory disorder or impairment

Sponsors & Collaborators

• University of Rochester: lead

Study Sites (1)

Brain and Cognitive Sciences, University of Rochester

Rochester, New York, 14604, United States

Location

Related Publications (1)

• Madelain L, Krauzlis RJ. Pursuit of the ineffable: perceptual and motor reversals during the tracking of apparent motion. J Vis. 2003 Nov 18;3(11):642-53. doi: 10.1167/3.11.1.

  PMID: 14765950 BACKGROUND

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assistant Professor

Study Record Dates

• First Submitted: September 20, 2017
• First Posted: October 2, 2017
• Study Start: October 26, 2017
• Primary Completion (Estimated): September 1, 2026
• Study Completion (Estimated): September 1, 2026
• Last Updated: October 10, 2025

Record last verified: 2025-10

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)