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| Specialised neurons that detect and respond to light by converting it into neural impulses that can be processed by the brain. |
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| Wavelengths that vary between 380 nanometers to 760 nanometers and can be received by the human eye. |
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| Photoreceptors that are important for daylight vision, visual acuity and colour vision. Cones do not operate well in dim light. |
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| Photoreceptors that are important for night vision because they are more sensitive to dim light than cones. Important for peripheral vision. |
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| A small area located in the center of the retina. 0.3 mm in diameter and contains a high concentration of cones. Visual acuity is highest in this area. |
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| The area in the eye where the optic nerve leaves the retina. Contains no rods or cones. |
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| The minimum amount of light energy that is necessary in order for a visual stimulus to be perceived 50% of the time. |
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| Differential threshold or (just noticeable difference) |
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| The smallest perceptible difference that can be detected between two visual stimuli by the eye 50% of the time. |
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| The process by which the structures of the eye capture an image of a visual stimulus and focus it on the photoreceptors contained in the retina. |
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| The process by which photoreceptors in the retina convert electromagnetic energy into electrochemical energy. This involves the use of photopigments. |
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| Chemicals that are sensitive to light and that are bleached into other chemicals by the light. |
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| The process of sending and receiving visual information in the form of electrochemical energy from neuron to neuron along neural pathways to the visual cortex in the brain. |
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| Photoreceptors activated by light, then they 'ignite' bipolar cells, which in turn trigger the firing of the ganglion cells. The ganglion cells converge to make the optic nerve which transmits neural impulses from the retina to the primary visual cortex. |
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| Process involving differentiating between various features that make up a visual stimulus. Occurs in almost all places of the visual perception system including cones, rods and within the visual cortex. |
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| Specialised neurons found in the visual cortex that detect specific 'features' of a visual stimulus. Each type may detect only certain features of a certain stimulus. |
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| A small area of visual information received by a cluster of photoreceptors. Feature detectors make 'selections' from these small sections of retinal image. |
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| The reassembling of features of visual information in an appropriate and meaningful way. |
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| The process of assigning meaning to sensory information detected by photoreceptors and transmitted to the brain. |
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| Sequence of visual perception |
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| Reception, transduction, transmission, selection, organisation, interpretation |
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