Question 1

Why can't some speakers hear the difference between certain sounds?

Accepted Answer

Because early in life the brain tunes itself to the **sound categories that matter in the surrounding language**, and distinctions that carry no meaning in that language stop being registered.

**The key concept is the phoneme.** A **phoneme** is a sound unit that distinguishes meaning in a given language. English *pat* and *bat* differ in one sound, so /p/ and /b/ are separate phonemes.

Crucially, sounds that are physically different can belong to the **same** phoneme. The *p* in *pin* is aspirated — a puff of air — while the *p* in *spin* is not. Physically distinct, and English speakers cannot easily hear the difference, because it never changes meaning. In Hindi and Thai, aspiration **does** distinguish words, and speakers hear it immediately.

**What happens developmentally.** Infants begin able to discriminate the sound contrasts of **all** languages. Research by Janet Werker and Richard Tees found that this ability **narrows** between roughly six and twelve months — infants lose the ability to discriminate contrasts absent from their environment while their ability to discriminate native contrasts sharpens.

This is **perceptual narrowing**, and it is not a loss so much as specialisation: the system becomes efficient at the distinctions that matter and stops spending resources on those that do not.

**The familiar examples:**

**Japanese speakers and English /r/ and /l/.** Japanese has a single liquid consonant covering that space, so the contrast is not phonemic, and adults find it genuinely difficult to hear — not merely to produce.

**English speakers and Hindi dental versus retroflex** stops, which sound identical to untrained ears.

**Arabic emphatic consonants**, **Mandarin tones**, and the vowel length distinctions of Finnish or Japanese.

**It is not irreversible.** Training studies show adults can improve substantially with intensive high-variability practice, though rarely reaching native performance.

**This explains accents too** — substituting the nearest native phoneme is the default when a sound is not in your inventory.

Question 2

What is the difference between phonetics and phonology?

Accepted Answer

Phonetics studies speech sounds as physical events; phonology studies how a particular language organises them into a system. One is about acoustics and articulation, the other about which

Question 3

Is there a critical period for learning a language?

Accepted Answer

There is strong evidence that earlier is better, particularly for accent and grammar, but the popular version — that a window slams shut at a fixed age — overstates what the research actually shows.

Question 4

What is the difference between a first, second and heritage language?

Accepted Answer

How and when a language was acquired, and in what environment — distinctions that matter because they predict very different patterns of ability. First language (L1, native language, mother tongue).

Question 5

What is a tonal language?

Accepted Answer

One in which pitch changes the meaning of a word, not just its emphasis or emotion — the same syllable said with a rising or falling pitch is a different word entirely. How common it is. Far more

Question 6

How do linguists reconstruct a language nobody wrote down?

Accepted Answer

By comparing descendant languages systematically and working backwards, using the fact that sound change is remarkably regular — the same sound in the same environment changes the same way throughout

Question 7

What is the difference between a homonym, a homophone and a homograph?

Accepted Answer

They describe three overlapping relationships between words, distinguished by whether the spelling, the sound, or both are shared. Homophones — same sound, different spelling and meaning. Their,

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