Q) What signal did the functional magnetic resonance imaging (fMRI) detect in this study?

A) Metabolic activity in the areas of the brain engaged during vergence

Q) What were the primary primary data from convergence insufficient patients compared with those from normal subjects?

A) When looking and CI vs. BNC patients, from baeline to post vergence training, the percent change in BOLD signal in the FEF, PPC, and CV significantly increased as well as the peak velocity. Peak velocity from BNC and PC patients before and after vergence training was directly correlated to the percent BOLD change.

Q) What are the visual symptoms commonly experienced by convergence insufficient patients?

A) Headaches, blurred vision and eye strain.

Q) What are the neural substrates metabolically active during vergence task that were confirmed in this study?

A) Frontal eye fields, posterior parietal cortex, and cerebellar vermis.

Q) What does the percent change of the blood oxygen level dependent response in the neural substrates obtained from the CI group after vergence training show?

A) Significant increase compared to their baseline measurement.