The eye has directional sensitivity that the cochlea entirely lacks

Evidence

A relevant question is how much the binaural hearing aids in decoding the sound spectrum emanated by multiple spatially separated sources, also in reverberant spaces. In vision, the spatial separation of sources definitely helps in the process, because when visual stripes are separated by more than about 0.1◦, they are discriminated. The working principle of the eye and the ear, however, differ greatly. The eye has a lens and a multitude of receptors primarily sensitive to the different directions from which light comes, while in contrast the ear has only one cochlea. Spatial hearing is conducted as an analysis of the ear canal signals, and no primary sensitivity to direction exists in the cochlea. A lesser advantage is expected with hearing, but, as will be shown below, a significant benefit is still obtained. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1510

Categorization

Category: Definitional Content

• DEFINE: Explains the fundamental anatomical difference between spatial vision and spatial hearing — the cochlea has no directional receptors.
• XREF: Connects to cocktail-party-effect literature and to the ear’s only-cochlea architecture vs. the retina’s spatial map.

Related

• The ear achieves spatial hearing through signal analysis rather than directional receptors (similarity 0.94)
• Unlike the eye, the ear has no primary directional sensitivity (similarity 0.92)
• Binaural hearing enables sound-source direction perception that one ear cannot produce (similarity 0.84)
• Robust spatial hearing despite reverberation has driven decades of binaural modeling research. (similarity 0.80)
• Acoustic engineering mostly needs cochlear knowledge, but spatial audio relies on SOC function (similarity 0.80)
• Each person’s directional hearing is calibrated to their own ear shape (similarity 0.79)
• The ear lacks the eye’s directional receptors, relying on canal analysis (similarity 0.79)
• The cochlea splits sound into narrowband signals that the brain processes individually (similarity 0.79)
• Hearing is ubiquitous and emotion-rich where vision is sectorial and information-rich (similarity 0.79)
• Hearing evolved as an omnidirectional alarm system complementing directional vision (similarity 0.79)
• Pinna, head, and torso shapes encode spatial direction into ear-canal sounds (similarity 0.79)
• Ear separation on one axis makes horizontal binaural cues strongest (similarity 0.78)
• Binaural hearing aid processing preserves spatial cues that monaural processing distorts (similarity 0.78)
• Auditory spatial information alone allows orientation in one’s surroundings. (similarity 0.78)
• Acoustic engineering usually needs only cochlear models, not higher nuclei (similarity 0.78)