Visual Perception

HideShow resource information
  • Created by: The Shrew
  • Created on: 21-01-16 12:20
Cornea
Fixed, focuses light
1 of 32
Pupil
The aperture in the iris- changes size according to light levels
2 of 32
Lens
focuses light, adjustable- accommodation
3 of 32
Retina
Rods and cone cells in retina convert light into electrochemical signal
4 of 32
When enough light falls on rod or cone cell
that cell sends electric signal down fibre and this triggers a chemical signal to another neurone which can send signals to other neurones
5 of 32
Only see tiny part of electromagnetic spectrum
Sceptopic vision- rod cells, low light/ phototopic vision- cone cells, normal day light
6 of 32
Cones are mostly in the
fovea
7 of 32
Move our eyes so
critical info falls onto high receptor density
8 of 32
Cones
specialised for colour vision/ high acuity
9 of 32
Outputs from only a few cone cells
are pooled together in normal conditions- low sensitivity, greater cell density- less pooling increases acuity 8 fold compared to rods
10 of 32
Rods found mostly in
periphery
11 of 32
Rods
No colour, low acuity
12 of 32
Outputs from hundreds of rod cells
pooled together for low light vision- high sensitivity, low density
13 of 32
Primates have 3 kinds of cones
short, middle, long
14 of 32
in 150ms, can detect if
animal present in scene
15 of 32
Complex interpretation made from
little colour and cues
16 of 32
Ambiguous figures
need to construct single image
17 of 32
Experience
effort after meaning, far from accurate, impossible figures, filing in gaps, sense of non-sense drawings
18 of 32
Right eye goes to
Left half of brain
19 of 32
Receptive field of neurone
Area of retina which when stimulated by light, affects the firing of that neurone
20 of 32
Areas of visual cortex organised into
retinopic maps where adjacent neurones in the brain have adjacent receptive fields in the brain
21 of 32
Modularity
Assumes different cognitive processes occur in anatomically separate, specialist brain areas
22 of 32
Processing
LGN (lateral geniculate cortex)-> visual cortex-> IT (Inferotemporal cortex)
23 of 32
Two visual pathways
Dorsal pathway- perception for visually guided action- how and where/ Ventral pathway- perception for recognition
24 of 32
Electrophysiological evidence
Neuropsychological imaging- separate systems!
25 of 32
Ungerleider and Mishkin
Separate cortical pathways for visual processing- object recognition and visuo-spatial perception
26 of 32
Face inversion effect
face specific processing/ misalignment effect
27 of 32
Different systems for object and face recognition
Shallice et al DD between Prosopagnosics and Agnostics
28 of 32
Farah et al
Patient LH- good at non-face objects/ not good at faces
29 of 32
Farah et al
Face requires global processing- sometimes used to identify objects
30 of 32
Global processing/ Local processing
*
31 of 32
BUT
Patients with object agnosia but no prosopagnosia or dyslexia/ Patients with prosopagnosia and dyslexia but no agnosia
32 of 32

Other cards in this set

Card 2

Front

Pupil

Back

The aperture in the iris- changes size according to light levels

Card 3

Front

Lens

Back

Preview of the front of card 3

Card 4

Front

Retina

Back

Preview of the front of card 4

Card 5

Front

When enough light falls on rod or cone cell

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Psychology resources:

See all Psychology resources »See all Cognitive Psychology resources »