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Lecture

PSY260H1 Lecture Notes - Visual Acuity, Absolute Threshold, Electromagnetic Spectrum


Department
Psychology
Course Code
PSY260H1
Professor
Jan Paulsson

Page:
of 6
Sensation and Perception
Sensation - is the process by which our senses
gather information and send it to the brain.
The Five Basic Senses are:
Hearing
Vision
Taste
Smell
Touch
Perception
Perception is the way our brain interprets
sensations and therefore makes sense of everything
around us. Our brain creates the world we inhabit.
Each of us creates our own unique perception of the
external world.
Virtual Reality (VR) is an environment that is
simulated by a computer. Your mind is fooled into
believing that a virtual world (created inside the
computer) is actually real.
Immersive Virtual Reality
Absolute Threshold
The absolute threshold is the point where
something becomes noticeable to our senses. It is
the softest sound we can hear or the slightest touch
we can feel. Anything less than this goes
unnoticed. The absolute threshold is therefore the
point at which a stimuli goes from undetectable to
detectable to our senses.
Difference Threshold
The difference threshold is the amount of
change needed for us to recognize that a change
has occurred. This difference is not absolute, but
rather depends on the present level of stimulation.
Vision
The human eye.
We see with our eyes only a very small part of the
entire electromagnetic spectrum.
Retina Receptor Cells (Rods and Cones)
RodsB & W, 120 Million
Light & Dark Only
Connected in parallel (party-line).
Share a data line to the brain.
Ramifications:
Need less light to function.
Responsible for our night vision.
Poor visual acuity.