Sperm counts of 10 million to 40 million sperm per milliliter of semen are considered normal

What is the absolute threshold?

a) largest detectable difference between two stimuli b) smallest detectable difference between two stimuli c) largest amount of stimulus energy that is detectable d) smallest amount of stimulus energy that is detectable

Baby Alfredo looks more intensely at a checkerboard with large black and white squares rather than one with smaller gray and white squares. Alfredo is demonstrating

A) contrast sensitivity. B) sensitivity to pictorial depth cues. C) proprioception. D) sensitivity to the visual cliff.