Circular Visual Tracking (CVT) Metrics in Neurocognitive States

Jianliang Tong 1, Samantha Wasserman1, Mackenzie Larsen1, Umesh Rajashekar1, Lisa Spielman1, Jun Maruta1, Jam Ghajar2
1Brain Trauma Foundation, NYC, NY, USA, 2Neurosurgery, Stanford University, Stanford, CA, USA


Attention is a core function for cognition and it is impaired following a concussion or mild Traumatic Brain Injury (mTBI). Since there is a large overlap in the neural networks subserving attention and eye movement control, it is possible that eye movement-based markers of attention impairments are useful when screening for mTBI. Our particular interest, for this study, was to  is in characterize a key role of attention in generating time-based expectancies of specific sensory information because it is postulated that post-concussion cognitive impairments and symptoms may stem from a primary deficit in this predictive timing mechanism.


We utilized continuous predictive visual tracking paradigms to assess individuals' attentional capacities. The capacity for predictive timing was quantified with indices of dynamic gaze-target synchronization. Indices for binocular coordination were also evaluated.


Preliminary results of data collected from subjects with varied neurocognitive conditions are as follows: normal, acute and chronic mTBI, ADHD, and sleep deprivation.


We demonstrated that the visual tracking indices provided fast and objective measures that allowed comparison of abnormal attentional states to a normative standard and allowed for monitoring within-individual changes.