A person with autism may have to sort through both major and minor stimuli—the sound of crickets, the smell of the fabric softener on their clothes, a car driving past outside—to determine which of these, if any, needs their attention.
A person with autism may have to sift through both significant and insignificant stimuli—the chirping of crickets, the scent of fabric softener on their clothes, a car driving past outside—to decide which of these, if any, requires their attention.