If a person is born without external ears (pinnae) or with a congenital hearing impairment, it may significantly affect their ability to perceive sounds in the traditional sense. However, it's important to note that hearing is a complex process that involves various structures and pathways in the ear and the brain.
The external ear, including the pinna, helps collect and funnel sound waves into the ear canal. If someone is born without external ears, they may still have the internal structures of the ear (such as the middle ear and inner ear) intact. In such cases, hearing aids or other assistive devices might be able to amplify sounds and provide some degree of auditory perception.
However, if someone is born without both the external and internal structures necessary for hearing, it becomes extremely challenging to experience sound in the conventional way. In these cases, alternative methods of sensory perception may be explored, such as cochlear implants or bone conduction devices. These devices bypass the normal hearing pathway and directly stimulate the auditory nerves or other sensory pathways to provide a sense of sound.
Regarding training oneself to "hear" sounds with the mind or head, there are ongoing advancements in the field of neuroplasticity and sensory substitution. Some research suggests that the brain has the ability to adapt and rewire itself to process sensory information from non-traditional pathways. For example, individuals who are deaf may be able to develop a form of auditory perception using visual or tactile cues. However, these methods are still being studied and are not yet widely available or fully understood.
It's important to consult with medical professionals and experts in audiology for personalized advice and guidance regarding specific cases of hearing impairment or sensory perception challenges.