Which neurotransmitter has been implicated in mania?

Which person is NOT making a downward social comparison?

a. Alan, who lost one leg in an accident, comparing himself to the driver, who was killed b. David, who loses his job, but gets a severance package with six months' salary, comparing himself to a colleague at another company who lost his job and received three months' severance c. Steven, who compares his driving skills today with those that he had when he was in high school d. Marty, who compares his coordination after contracting multiple sclerosis with that which he had before the disease

During voluntary eye movements (saccades), people briefly lose their ability to detect one aspect of vision. That aspect is _______

Fill in the blank(s) with correct word