Findings from the Seattle Longitudinal Study indicate that cognitive losses in middle age are relative to cognitive declines that we see in later adulthood.

The correct answer is - Perceptual speed

Explanation:

The ability of an individual to identify and compare accurately the various things, letters, objects, pattern, and other thing is known as the perceptual speed. It can be tested these objects may be shown one after another.

The Seattle longitudinal study is believed to be one of best extensive psychological study that says that perceptual speed is cognitive declines that one see later adulthood relative to middle age.

Thus, the correct answer is - Perceptual speed.