Visual Perception 0.0 / 5 ? PsychologyCognitive PsychologyUniversityNone Created by: The ShrewCreated 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
Comments
No comments have yet been made