Ch 2: human factors (week 2 01. 25: newel"s time scale, (2) hearing = audition. Sound = cyclic fluctuations of pressure in a medium (air) Ex. sources: door slam, pluck guitar string, shuffle cards, speaking: (3) touch = tactition, part of somatosensory system. Receptors in skin, muscles, joints, bones results: (1) sense of touch, (2) pain, (3) temperature, (4) position, (5) shape, (6) texture, (7) resistance. Sensors human senses, includes: (1) sight = vision. People obtain 80% of their information through the eye. Fovea image = 1% of retina, 50% of visual cortex, 1 of visual image result: sharp central vision: 2. Responders methods humans use to control their environments: ex responders: (1) finger to text/point, (2) feet to walk/run, (3) eyebrow to frown, (4) vocal chords to speak, (5) torso to lean. Fixations = eyes stationary, take in visual details from environment. Duration: long or short typically at least 200ms.