Lecture 5

Question 1

Receptor Potential

Answer 1

change in the MP due to receipt of signal from exterior sensory cue

Question 2

2 Stages of Amplification

Answer 2

1. G-protein can activate a number of different enzyme molecules
2. Each of these enzyme molecules will produce lots of 2nd messenger (cAMP)

Question 3

2 Categories of Sensory Cell Transmission

Answer 3

1. AP
2. Vesicles

Question 4

Transmission of Signal (AP)

Answer 4

sensory cell generates an action potential at a spike-generating zone

Question 5

Transmission of Signal (Vesicles)

Answer 5

Sensory cell releases vesicles when depolarized; impulses generated in post-synaptic neuron

Question 6

Adaptation

Answer 6

The MP can decay over time leading to ‘Adaptation’

Question 7

2 Types of adaptations

Answer 7

1. Slowly Adapting
2. Rapidly Adapting

Question 8

Adaptation (Slow )

Answer 8

receptor potential sustained for the duration of the stimulus
- Interested in the overall magnitude of the stimulus

Question 9

Adaptation (Rapid)

Answer 9

receptor potential elicited by change in stimulus energy, decays to zero when stimulus is constant

Question 10

Habituation

Answer 10

repeated stimuli (identical) in succession elicit progressively weaker responses

Question 11

Population Code

Answer 11

is coding using the ratio of activity from a restricted number of different receptor types

Question 12

Receptive Field

Answer 12

Receptive Field of a given sensory neuron is the territory in which you could activate that neuron