Distance is measured from the speaker: The Ko-So-A-Do matrix

Mental Model: The Four Spatial Quadrants

Every demonstrative word in Japanese is built from an elegant mathematical system known as the Ko-So-A-Do matrix (こそあど):

• こ (Near the Speaker): Inside the speaker's personal physical territory or immediate reach.
• そ (Near the Listener): Inside the conversation partner's territory or immediate reach.
• あ (Distant from Both): Outside the immediate territory of both people; both parties look outward to locate it.
• ど (Question / Unknown): Undetermined identity; asks the listener to specify among alternatives.

The Complete Matrix Across 5 Dimensions

Once you know the prefix (こ, そ, あ, ど), you can generate words across five vital grammatical dimensions:

• 1. Stand-Alone Pronouns (Things): これ (“this one”) · それ (“that one near you”) · あれ (“that one over there”) · どれ (“which one?”).
• 2. Adnominals (Noun Modifiers): この [noun] (“this [noun]”) · その [noun] (“that [noun] near you”) · あの [noun] (“that [noun] over there”) · どの [noun] (“which [noun]?”).
• 3. Physical Locations (Places): ここ (“here”) · そこ (“there”) · あそこ (“over there”) · どこ (“where?”). *Notice that あ-form is あそこ, not *あこ!
• 4. Directions & Polite Demonstratives: こちら (“this way / this person”) · そちら (“that way”) · あちら (“that way over there”) · どちら (“which way?”).
• 5. Manner and Style: こう (“like this / this way”) · そう (“like that”) · ああ (“like that over there”) · どう (“how / in what way?”).

Psychological Distance in Conversation

Demonstratives are not limited to physical geography—they navigate conversational memory:

• Shared Mutual Knowledge (あの): When referring to an experience or person both speaker and listener know well: あの映画、面白かったですね。(あのえいが、おもしろかったですね。) (“That movie [we both saw], it was great, wasn't it?”).
• Partner's Territory or New Information (その): When referring to an idea or topic the other person just introduced into the conversation: その話、もっと 教えてください。(そのはなし、もっと おしえてください。) (“Please tell me more about that story [you just mentioned].”).