E2 Perception of Stimuli

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Presentation transcript:

E2 Perception of Stimuli To what extent is what we perceive a construct of our minds and limited by the receptors we have?

E2.1 Sensory receptors Mechanoreceptors: respond to mechanical force or pressure E.g. pressure receptors in arteries respond to change in blood pressure, pressure receptors in our inner ear are sensitive to waves of fluid Chemoreceptors: respond to chemical substances E.g. pain receptors respond to chemicals released by damaged tissues E.g. taste receptors in tongue

E2.1 Sensory receptors Thermoreceptors: respond to change in temperature E.g. warmth receptor/cold receptor Photoreceptors: respond to light energy E.g. rod cells (black/white vision) and cone cells (color vision)

E2.2 The human eye

E2.4 Rod vs Cone cell Rod Cone Sensitive to light and function in dim light Less sensitive to light and function in bright light One type of rod: absorbs all wavelengths of visible light Three types of cones: sensitive to red light, blue light and green light respectively Group of rod cells (up to 200) connected to optic nerve Single cone cell connected to optic nerve Widely dispersed through the retina give wider field of vision Cone cells concentrated near fovea

E2.3 The retina Rod/cone cells synapse with bipolar neurons which synapses with a ganglion cell. Axons of the ganglion cell make up the optic nerve.

Which side of the band is darker?

Contralateral processing Nerve fibers bringing information from the right half of the visual field converge at optic chiasms and pass to the left brain (and vice versa) = contralateral processing Two eyes are apart, images are slightly different  3D stereoscopic vision