Chapter 2- sensation and perception Flashcards
Vision
- only sense with full lobe for (occipital)
- Cones and rods (more as we move far away from center so looking from side is better)
Macula
- Area with majority cones in the center
- Fovea: all cones
Visual pathway
- Optic chiasm -> LGN which then synapses with ex: superior colliculi
- parallel processing: process color, form, shape…
- superior colliculus
Parvocellular cells
for objects not moving
Magnocellular
Objects moving
Binocular neurons
Compare from 2 hemispheres to judge the input
Hearing (vestibular sense)
- Organ of corti in cochlea in inner ear to hear
- inferior colliculus
- Medial geniculate nucleus (MGN): music (hearing)
Place theory
- Hair placed tonotypically for dif pitches
Higher pitch closer to window
Smell
- Only sense that passes through brain avoiding hypothalamus
Somatosensation
Touch
- pressure, vibration, temperature, pain
Ruffini endings
Stretch (italian)
Pacinian corpuscles
deep pressure & vibration (pace of baby that sucks on it)
Meissner corpuscles
- Light touch (mice)
Merkel discs
deep pressure & texture (annoying name)
Free nerve endings
Pain & temperature
Pathway of somatosenation
Pain & temperature diff pathway than pressure & vibration
2 point threshold
Min distance to be recognized as 2
Gate theory of pain
Since pain takes another root than pressure & vibration, rubbing someone’s wound would make it decrease pain
Webers Law
K= delta I/I (how much of a change compared to normal would the person be able to distinguish
- should be = or greater than what person can tell initally
Gestalt principles (illusions made from them)
- Similarity: similar objects grouped together by brain
- Pragnanz: reduced to simplest form (ex: audio sign seen as circles not more complex shapes)
- Proximity: objects close to each other are grouped together
- Continuity: see lines as following the smoothest path
- Closure: Objects grouped together seen as 1
