Sense- bio system
-​ Detects form of physical energy
-​ Transduces into neural
-​ Allows brain to interpret
1.​ Physical energy
a.​ Light, sound. Pressure
2.​ Transduction
a.​ Energy → chemistry → voltage
3.​ Action potential
4.​ Dedicated pathway to primary cortext
a.​ Through thalamus first (all senses BUT
smell)
Vision:
Photons are units that quantify light waves
Light- subset of electromagnetic radiation
Visible: 400-700 nanometres
We detect NOT absorbed but reflected
Retina → ganglion cells
Why have 2 eyes? 3D and depth perception (binocular disparity)
Saccades- eyes moving unconsciously (too fast to perceive)
Cornea- bends light entering eye
Iris- muscle that determines how much light enters (creates pupil)
Lens- changes shape to focus light onto retina (far and near)
-​ Cilairy muscles
Retina- layer of neurons on the back of the eye
-​ Photorecepters (rods and cones)
-​ Bipolar
-​ Ganglion (to the brain)