Sound waves vary in amplitude and frequency. Amplitude is that the sound wave's peak pressure variation. Frequency is that the number of cycles per second of a sinusoidal component of a wave. Loss of the power to detect some frequencies, or to detect low-amplitude sounds, that an organism naturally detects, may be termed as a hearing disorder. Hearing sensitivity is indicated by the quietest sound that a person can detect, termed the hearing threshold. The normal hearing threshold is not the same for all frequencies of sounds. Long-term exposure to environmental noise, Genetics, Disease or illness, Medications, and Physical trauma are different biological mechanisms for hearing loss.
Hearing impairment pathophysiology
Hearing impairment causes
Hearing impairment social impact
Mental retardation pathophysiology
Hearing impairment risk factors
Mental retardation causes
Autism causes
Personality disorder causes