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Sensation and Perception

Course Code
Michael Inzlicht

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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
-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 )
-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
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
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