3. Disconnection anomia
This type of anomia actually results from the complete or partial severing of the vital connections between sensory and language cortices in the brain. Patients or people blighted with disconnection anomia are prone to exhibiting what is known as modality-specific anomia, where the anomia is limited.
This particular type of anomia is limited to a specific sensory modality, with the hearing being a specific example of one such modality. To put this into some context, a patient who is more than capable of naming a target object when it is presented to them through the medium of certain sensory modalities such as audition or touch, may still be unable to name the same object when the object is presented in a different way, for instance when it is presented visually.
This is a further stage of complication that a person with anomia can expect to face and is perhaps best considered as another level up from semantic anomia, as described above.