CAS PS 222 Lecture Notes - Lecture 3: Receptive Field, Absolute Threshold, Peripheral Vision
18 May 2018
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In the absence of stimulations, they are generating baseline firing rate activity.
The degree of stimulation will determine the activity or the firing rate of these neurons. There
is a relationship between the neurons and the receptor fields.
Relationship between the intensity of the stimulus and the firing activity of the neuron.
However, the neuron cant fire up infinite spikes and thus there is a maxing out.
Resolution: if you apply two point on a big given area sensory surface, you cant tell the
differee iside that sesory surfae eause it’s a loer resolutio. The euro at tell the
difference between sets of two different points.
Two neurons sharing a sensory surface: higher resolution and can tell the area generating the
stimulus.
Low intensity stimulus: summed response registers stimulus which allows you to be more
sensitive.
Measuring Perception:
Absolute threshold: how strong does a stimulus have to be for us to respond to it?
Difference threshold: how much change do we need between stimuli for us to be able to detect
it? E.g. Difference intensity of light.
Light and the Eyes:
What does it mean for us to see or perceive? – All our perception has to be constructed from a
single physical source is the light. The light that is being reflected off the surfaces around us.
How do we take that light and turn it into objects?
So what is light? – Light is electromagnetic radiation and wave and particles.
Some light is visible. And Visible light is composed of different wavelengths. However, some
light is not visible.
As you decrease the length of the wave, you increase the energy level.
We only see a tiny portion of the light that is out there. Why? Because wavelengths matter.
Big long wavelengths like FMs, microwaves are so large that they go around objects. Therefore,
e aot see it as it does’t ot reflet off a surfae.
find more resources at oneclass.com
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Document Summary
In the absence of stimulations, they are generating baseline firing rate activity. The degree of stimulation will determine the activity or the firing rate of these neurons. There is a relationship between the neurons and the receptor fields. Relationship between the intensity of the stimulus and the firing activity of the neuron. However, the neuron cant fire up infinite spikes and thus there is a maxing out. Resolution: if you apply two point on a big given area sensory surface, you cant tell the differe(cid:374)(cid:272)e i(cid:374)side that se(cid:374)sory surfa(cid:272)e (cid:271)e(cid:272)ause it"s a lo(cid:449)er resolutio(cid:374). The (cid:374)euro(cid:374) (cid:272)a(cid:374)t tell the difference between sets of two different points. Two neurons sharing a sensory surface: higher resolution and can tell the area generating the stimulus. Low intensity stimulus: summed response registers stimulus which allows you to be more sensitive. All our perception has to be constructed from a single physical source is the light.
