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Definition
| The elaboration and interpretation of a sensory stimulus based on, for example knowledge of objects are structured. |
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| The effects of a stimulus on the sensory organs |
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| The internal surfaces of the eyes containing photoreceptors that convert light to neural signals |
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| A type of photoreceptor specialized for low levels of light intensity, such as those found at night |
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| A type of photoreceptor specialized for high levels of light intensity, such as those found during the day, and speicalized for the detection of differennt wave lengths. |
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Definition
| The point at which the optic nerve leaves the eye. There are no rods and cones present here. |
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| Primary Visual Cortex (V1) |
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Definition
| The first stage of visual processing in the cortex; the region retains the spatial relationships found on the retina and combines simple visual features into more complex ones. |
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Definition
| The region of space that elicits a response from a given neuron |
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Definition
| In vision, cells that respond to light in a particular orientation |
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Definition
| In vision, cells that respond to light in a particular orientation but do not respond to single points of light. |
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Definition
| In vision, cells that respond to particular orientations and particular lengths. |
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Definition
| Cortical blindness restricted to one-half of the visual field (associated with damage to the primary visual cortex in one hemisphere) |
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Definition
| Cortical blindness restrcited to a quarter of the visual field |
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Definition
| A small region of cortical blindess |
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Definition
| A symptom in which the patient reports not being able to consciously see stimuli in a particular region but can nevertheless perform visual discriminations (e.g. long, short) accurately |
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Definition
| A region of extrstriate cortex associated with color perception |
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Definition
| A region of extrstriate cortex associated motion perception |
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Term
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Definition
| A failure to percieve color ( the world appears in grayscale). Not to be confused with color blindness (e.g. in which red and green cannot be dicriminated) |
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Definition
| A failure to perceive visual motion |
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Definition
| The color of a surface is perceived as constant even when illuminated in different lighting conditions. |
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Definition
| The ability to detect whether a stimulus is animate or not from movement cues alone. |
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Definition
| A memory representation of the three-dimensional structure of objects. |
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Definition
| Failure to understand the meaning of objects due to a deficit at the level of object perception |
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Definition
| A failure to understand the meaning of objects due to a deficit at the level of semantic memory |
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Term
| Figure-ground Segregation |
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Definition
| The process of segmenting a visual display into objects versus background suraces |
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Definition
| A failure to integrate parts into wholes in visual perception |
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Definition
| An understanding that objects remain the same, irrespective of differences in viewing conditions |
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| Object orientation Agnosia |
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Definition
| An inability to extract the orientation of an object despite adequate object recognition. |
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Definition
| The notion that the brain represents different categories in different ways (and /or different regions) |
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| Face Recognition units (FRU) |
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Definition
| Stored knowledge of the three-dimensional structure of familiar faces. |
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| Person Identity nodes (PIN's) |
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Definition
| An abstract description of people that links together perceptual knowledge (e.g. faces) with semantic knowledge |
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Definition
| Impairments of face processing that do not reflect difficulties in early visual analysis (also used to refer to an inability to recognize previously familiar faces.) |
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Definition
| A map of space coded relative to position of the body |
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Definition
| A map of space coded relative to the position of the eye |
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Definition
| A map of space coding the locations of objects and places realtive to each other. |
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Definition
| Integrating information across sensory modalities |
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Definition
| The process by which certain information is selected for further processing and other information is discarded |
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Definition
| A failure to sonsciously see soemthing because attention is directed away from it |
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Term
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Definition
| Participants fail to notice the appearance of objects between two alternating images |
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Definition
| In a non-lesioned brain there is over attention to the left side of space. |
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Definition
| a slowing of reaction time associated with going back to a previously attended location |
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Definition
| Attention that is externally guided by a stimulus |
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Definition
| Attention is guided by the goals of the perciever |
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Definition
| A task of detecting the presence or absence of a specific target objet in an array of other distracting objects |
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Definition
| The ability to detect an object amongst distractors objects in situations in which the number of distractors presented is unimportant |
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Term
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Definition
| A situation in which visual features of two different objects are incorrectly perceived as being associated with a single object |
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