Sensation and Perception

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Lecture 4: Sensation and Perception
Perception isn’t reality
Perception is unique, it is subjected to us. No two perception is the same
Psychophysics
-Sensation is the stimulation of sense organs -> is the same for everyone (uniform)
-How we take energy from the world can convert it to neuro impulses in the brain
-Ignore 90% of stuff around us, and only 10% is what we pay attention to because
paying attention to everything would cause sensory overload
-Based on unconsciousness - the 10% is unique to us (subjected to what we want
to pay attention to based on various factors)
-How we organize, select, understand, and see -> Perception
Threshold
-Absolute Threshold is the point at which the min. amount of energy that our
stimulus activation can detect at 50% of the time (we have sense it )
-For conscious perception
-Once we have Absolute Threshold, it becomes the Just noticeable difference
-Is constant
-Higher intensity needs to be added in order to notice the difference
-However we have our own unique Absolute Threshold
The Visual System
-Sense that we depend on the most for survival
-Detection of colour and movement
Details of the Human Eye
Cornea
Pupil – regulate the amount of light, when it is bright it contracts; expands and dilates
Lens – Bend the light when it comes thro so that it impacts a proper space in the back of
the eye; semi-circle, should be round (if not, stigmatism occurs)
Iris – band of muscles behind the pupils,
Fovea – is sensitive to light
-has rods and cones
-Rod – is sensitive to light so it allows us to see in the dark
Blind Spot
Retina – Round circle that is back of the eye
Vitreous humor
Aqueous Humor – oxygenate the eyes,
-are liquids that help moisten eyes
Optic nerve – bundle of axons
Blind spots
Visual Pathways on Brain: Where vs. What
www.notesolution.com
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Document Summary

Perception is unique, it is subjected to us. Sensation is the stimulation of sense organs -> is the same for everyone (uniform) How we take energy from the world can convert it to neuro impulses in the brain. Ignore 90% of stuff around us, and only 10% is what we pay attention to because paying attention to everything would cause sensory overload. Based on unconsciousness - the 10% is unique to us (subjected to what we want to pay attention to based on various factors) How we organize, select, understand, and see -> perception. Absolute threshold is the point at which the min. amount of energy that our stimulus activation can detect at 50% of the time (we have sense it ) Once we have absolute threshold, it becomes the just noticeable difference. Higher intensity needs to be added in order to notice the difference. However we have our own unique absolute threshold.

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