Vision/Photoreception Flashcards
1
Q
What is the role of sensory perception?
A
- spatial scale
- signal dispersal fields from prey
2
Q
The fish eye ____ ____ throughout life. What does eye size correlate to?
A
- continuously grows
- correlates to body size
3
Q
Fish eyes are designed for ____ and ____
A
- sensitivity and acuity
4
Q
Define sensitivity
A
- detection threshold
5
Q
Define acuity
A
- clarity/sharpness of vision (resolution)
6
Q
What are the 3 functions of the fish eye?
A
- capture light
- focus image onto retina
- transform image to neural signals
7
Q
How do fish capture light?
A
- collection
8
Q
What is the function of the retina
A
- light detection
9
Q
what happens to neural signals?
A
- integrated and processed by brain
10
Q
What do photoreceptors consist of?
A
- rods and cones
11
Q
What are rods?
A
- respond to dim light - poor sharpness (SENSITIVITY)
12
Q
What are cones?
A
- acuity
- colour vision in some fish
13
Q
What is the pineal gland for?
A
- ultrasensitive light sensor
- cues circadian/seasonal behaviour
