Some perception, such as position sense, is retained.
The same with most tasks involving sensory perception, such as determining if a soccer ball has crossed a goal line.
Such patients tend to present initially with complex visual disturbances — difficulties reading (alexias) or recognizing faces and objects (agnosias) — while more elementary forms of visual perception, such as movement and color perception, are perfectly preserved.
In stories like this, the prose is spare and clean, and there are moments of acute perception, such as this from "Phoenix": "Somehow it seems wrong to photograph a blind person.
The neurologist Richard Gregory, for example, argued in 1993 that no theory of direct perception, such as that proposed by Gibson, could be supported, given "the indirectness imposed by the many physiological steps or stages of visual and other sensory perception.
Perception, such as vision, generally has a connection to the objects that one perceives.
Are there internal conditions on perception (such as attention or focus, viewed by some as a voluntary act)?
This suggests that this prior is similar to other examples of amodal perception, such as the Michotte Triangle.
The quality of enhanced speech is generally assessed by subjective perception, such as speech intelligibility, naturalness, and articulation.
Psychoacoustic tests can be carried out to evaluate various dimensions of music perception such as pitch, melody, and timbre.
To see this, consider a case of ordinary tactile perception, such as when one perceives that the table before one is hard by touching it.
