Receptive Fields And Central Representations (7) ** Flashcards
Transmission
When energy nerve signals travel from the receptors to the brain
Processing
Interactions between neurons
The receptive field of a (visual) neuron **
The small area on the retina which, when stimulated, influence the firing rate of this visual neuron
How does a receptive field display light and luminous edges
Compares the relative activities of the on vs off centres
How are complex cells different to simple cells
They respond to movement of light bars in a specific direction
How are complex cells (in the primary visual cortex/ v1) similar to simple cells
They respond to bars of light in a particular orientation
End stop cells (in V1) respond to…
Moving lines of a specific length
No response to stimuli that are:
Too long / too large
3 examples of cells in V1 that resemble feature detectors (orientations?)
Simple cortical cell
Complex cortical cell
End-stopped cortical cell
What do end-stopped cortical cells in V1 respond to
Corners, angles or bars of a particular length, moving in a particular direction
Experiment by DeAngelis et al
Monkey was trained to indicate depth from disparate images
Disparity-selective neurons were activated by this process
Experimenter used micro stimulation to activate different disparity-selective neurons
The monkey shifted judgment to this
Signals from the retina travel through the optic nerve to…
The Lateral Geniculate Nucleus (LGN)
Dorsal stream
Upwards
Ventral stream
Downwards
