Week 6 Flashcards
What is occulomotor?
Position of our eyes and the tension in the eye muscles; eyes converge on very close objects
What are pictorial cues to depth?
Size, texture, linear perspective, proximity to horizon, atmospheric perspective, shading.
What is the difference between size for depth and linear perceptive?
Retinal image size varies with distance = if you now the size of an object, you can use its apparent size as a cue to depth.
Related to size judgments; assume equal size with increasing distance.
What is atmospheric perspective?
Light is scattered by air particles; objects further away are obstructed by more particles, objects that are blurred must therefore be further away.
What are binocular cues and what is relative depth in relation to this?
Each eye is in a different position in the head so sees the world from a slightly different angle. The brain could use this info to calculate the depth of an object
Things are different distances will have images at different points in the 2 eyes.
How does fixation work?
Object placed on fovea in both eyes.
What is motion parallax?
A result of self motion through the world - the visual system assumes that motion of all objects in the world is unlikely, therefore the different velocities of different objects in the world results from their relative distance from the observer.
What are the three types of motion perception?
Simple, complex, self motion
What is difference between real motion and complex motion?
Involves a change in position over time - V1 cells code simple motion.
Where simple motion is ignored in favour of group or object motion. Biological motion is an example.
What are the two theories of face perception?
Key features - parts; whole face - holistic.
How is sound produced?
By the movement of a medium
What is the difference between frequency and intensity in relation to auditory perception?
Frequency - location of maximal excitation on basilar membrane; intensity - discharge rate of affected hair cell neurons
What are the two types of hair cells in the ear?
Inner hair cells - make up 95% of connections; outer hair cells - make sparse connections. All hair cells are frequency selective.
What is sound localisation?
Interaural intensity differences. When a sound is located directly in front, the time difference is 0.
What does the cochlea do?
Auditory info in encoded by frequency and intensity in the cochlea. Little hairs sit in the cochlea which are connected to auditory neurons. These neurons are activated by mechanical movement of the stereocilia in the cochlea, so when waves move the hairs, the neurons are activated.
