Feedforward, feed back, and lateral

Question 1

At excitatory synapses, an AP of presynaptic neuron increases the probability of what?

Answer 1

increases the probability that an AP will be produced in a postsynaptic neuron

Question 2

Feedforward excitatory connection

Answer 2

Information from a lower level of a circuit being transmitted to a higher level

Question 3

Feedback excitatory connection

Answer 3

Information is transmitted back from a higher level neuron to a lower level neuron.
-Output of these circuits can influence the input neurons

Question 4

Lateral excitatory connection

Answer 4

Communication between neurons within the same processing level

Question 5

At inhibitory synapses, an AP of presynaptic neuron decreases the probability (or inhibits entirely)…..

Answer 5

that an AP will be produced in a postsynaptic neuron

Question 6

Feedforward inhibitory connection

Answer 6

The output of one level decreases the activity of the next

Question 7

Feedback inhibitory connection

Answer 7

The output of a higher order level of a circuit decreases or ceases the input activity to that circuit

Question 8

Lateral inhibitory connection

Answer 8

The activity of ones set of neurons can decrease or cease the activity of other neurons at the same level

Question 9

Disinhibition

Answer 9

Inhibitory interneurons can sometimes be used indirectly to cause net excitation within a circuit by inhibiting a strong inhibitory interneuron (pg 7)

• A particular neuron may receive both (-) and (+) input, but because the (-) is stronger, the neuron is silent.
• If the neuron providing the (-) input is inhibited, the (+) input will be allowed to fire the silent neuron

Question 10

Disinhibition is an important feature of…

Answer 10

all local circuits

Question 11

Where is disinhibition observed in many brain regions?

Answer 11

neocortex, the cerebellum, the dorsal striatum, the thalamus, the hippocampus and others