***DUTCH***EXTENSIVE SUMMARY LECTURES - PERCEPTION & MOTOR CONTROL LECTURE 7 - 13
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Course
0HV20 Perception And Motor Control (0HV20)
Institution
Technische Universiteit Eindhoven (TUE)
Book
Human Motor Control
*** Extensive Summary of lectures 7 - 13 for the course "perception & motor control" in DUTCH. All images and text from the slides are included, as well as important text from the reading material. ***
The retina: Receptive fields
Receptive fields: Neuronen in de somatosensory
cortex (touch).
- Stimulus space: Fires for a certain region
on the skin
- Stimulation in centre → excitatory
- Stimulation in surround → inhibitory
o Centre-surround structure
o Lateral inhibition of nearby
neurons
o Receptive fields vary in size.
Visual neurons reageren meestal op een
bepaald lichtpuntje. Het is vaak interessant om te weten welke (externe) prikkels (stimuli) een neuron
activeren om te vuren.
Definitie: De stimulus space die ervoor zorgt dat een neuron vuurt, wordt een receptief veld genoemd.
- Een receptief veld is een eigenschap van een neuron
- De stimulusruimte kan vele dimensies hebben
- (Sensorische) neuronen vuren meestal voor een reeks gebeurtenissen
,Receptive fields: Ganglion cells in the retina
The stimulus space
• Location (on a screen) (spatial opponency)
• Colour content (spectral opponency)
The receptive field has a centre-surround structure
• Excitatory centre & inhibitory surround (or vice versa)
• Varying sizes
• Lateral inhibition
Lateral inhibition of Cones
• Spatial opponency
• Neighbouring cones inhibit each other
• Spectral opponency
• Different cone types inhibit each other
, Receptive fields: Spatial opponency
On-cells
• Excitatory centre
• Inhibitory surround
Off-Cells
• Inhibitory centre
• Excitatory surround
• Functionally equivalent -> always explain using ON-cells
Receptive field response:
Ricco’s law
Intensity * Area = Constant Treshold Value
Valid up to 10 arc min (1 mm at arms length)
Contrast & Receptive fields:
Mach Band Illusion
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