We all have ear canals that hear sounds, and differently shaped outer ears that focus sounds into those canals.
|
|
Reportedly lightweight and cozy, these headphones are designed to sit on top of your outer ears — kind of like a high-fashioned ear cuff.
|
|
This sensitivity is further enhanced by the cat's large movable outer ears (their pinnae), which both amplify sounds and help a cat sense the direction from which a noise is coming.
|
|
Figala und Mitarbeiter 1973 (Abstract). Die Angaben beziehen sich auf unter natürlichen Bedingungen gehaltene Hamster. The outer ears and the eyes have black edges. The rest of the head is dark brown or black.
|
|
Greys are depicted as having unusually large heads in proportion to their bodies with no hair on the body, and no noticeable outer ears or noses, sometimes with small openings or orifices for ears, nostrils, and mouths. In drawings, Greys are almost always shown with very large opaque black eyes. They are frequently described as shorter than average adult humans.
|
|
The pinna originates as a fusion of six hillocks. The first three hillocks are derived from the lower part of the first pharyngeal arch and form the tragus, crus of the helix, and helix, respectively. The final three hillocks are derived from the upper part of the second pharyngeal arch and form the antihelix, antitragus, and earlobe. The outer ears develop in the lower neck.
|
|
Most of the skull is solid bone, and it has a distinctive single median tooth in the upper jaw. It has no outer ears, and the eyes are deeply recessed and covered with skin and scales. The body is elongated, and the tail truncates in a manner that vaguely resembles the head. It lacks legs but has remnants of the pelvic and pectoral girdles embedded within its body musculature.
|
|
Most of the skull is solid bone, with a distinctive single median tooth in the upper jaw. It has no outer ears, and the eyes are deeply recessed and covered with skin and scales. These rudimentary eyes have a cornea, lens, and complex ciliary body, which allows them to detect light, but they are reduced in size and do not have an anterior chamber.Foureaux, G., Egami, M.I., Jared, C., Antoniazzi, M.M., Gutierre, R.C., Smith, R.L., 2010.
|
|
Spinose ear ticks are a constant source of annoyance and irritation for their definitive hosts. Their tendency to occur in large numbers can cause ulceration of the inner ear, high sensitivity of the ears, large amounts of blood loss, and even deafness. Heavily infested animals often shake and rub their heads, which can cause their outer ears to become excoriated and raw. Several cases of human infestation have been reported, and the tick has been incriminated in some instances of pathogen transmission.
|
|
The domestic cat's hearing is most acute in the range of 500 Hz to 32 kHz. It can detect an extremely broad range of frequencies ranging from 55 Hz to 79,000 Hz. It can hear a range of 10.5 octaves, while humans and dogs can hear ranges of about 9 octaves. Its hearing sensitivity is enhanced by its large movable outer ears, the pinnae, which amplify sounds and help detect the location of a noise. It can detect ultrasound, which enables it to detect ultrasonic calls made by rodent prey.
|
|
Hearing (or audition) is the ability to perceive sound by detecting vibrations (i.e., sonic detection). Frequencies capable of being heard by humans are called audio or audible frequencies, the range of which is typically considered to be between 20 Hz and 20,000 Hz. Frequencies higher than audio are referred to as ultrasonic, while frequencies below audio are referred to as infrasonic. The auditory system includes the outer ears, which collect and filter sound waves; the middle ear, which transforms the sound pressure (impedance matching); and the inner ear, which produces neural signals in response to the sound.
|
|
During flight, the left ear receives sounds from below them and the right ear receives sounds from above them. The feathers on the edge of barn owl’s face creates a disc that works to trap and focus sound, similar to the outer ears of humans. The sound waves travel through the owl’s ear canal until they reach the eardrum, through the ossicles, and into the inner ear so that the owl is able to perceive exactly where their prey is located. As owls depend on their ability to track prey using their super sense of hearing in order to survive, it is important to understand the structures of the ear of barn owls that work to transmit these sounds.
|
|
Good headphones, well sealed to the ear, provide a flat low- frequency pressure response to the ear canal, with low distortion even at high intensities. At low frequencies, the ear is purely pressure-sensitive, and the cavity formed between headphones and ear is too small to introduce modifying resonances. Headphone testing is, therefore, a good way to derive equal- loudness contours below about 500 Hz, though reservations have been expressed about the validity of headphone measurements when determining the actual threshold of hearing, based on the observation that closing off the ear canal produces increased sensitivity to the sound of blood flow within the ear, which the brain appears to mask in normal listening conditions . At high frequencies, headphone measurement becomes unreliable, and the various resonances of pinnae (outer ears) and ear canals are severely affected by proximity to the headphone cavity.
|
|