00 · IN THREE MINUTES

The answer in three steps

  1. 1Words and sounds from both languages can become active even when only one is required.
  2. 2Control processes raise the target language and manage competing alternatives.
  3. 3The strategy adapts to context: separate-language settings, frequent switching and dense code-switching make different demands.

01 · BOTH LEXICONS CAN ANSWER

Both lexicons can answer

Pictures and heard words activate related candidates across languages. Cognates, cross-language neighbours and interference effects show that selection is not a clean on-off switch.

02 · A GOAL BIASES SELECTION

A goal biases selection

Prefrontal and subcortical control networks help maintain the intended language, detect conflict and select an utterance. Inhibition may contribute, but activation and contextual prediction matter too.

03 · SWITCHING HAS A MEASURABLE COST

Switching has a measurable cost

In laboratory naming tasks, a language switch often slows response or increases errors. Costs can be asymmetric because returning to a dominant language may require releasing stronger prior suppression.

FIG. 02 · INTERACTIVEHow the evidence fits together

A conceptual model: the geometry shows relationships, not measured scale.

1

Both lexicons can answer

Pictures and heard words activate related candidates across languages. Cognates, cross-language neighbours and interference effects show that selection is not a clean on-off switch.

co-activation
A conceptual model: the geometry shows relationships, not measured scale.

04 · REAL CONVERSATION TRAINS DIFFERENT MODES

Real conversation trains different modes

The adaptive control hypothesis predicts that a dual-language context, a single-language context and habitual code-switching recruit control in different ways.

05 · BILINGUALISM IS NOT ONE CONDITION

Bilingualism is not one condition

Age of acquisition, proficiency, similarity of the languages and daily switching patterns vary widely. Brain and behaviour findings should not be generalized from one bilingual group to all.

06 · SOURCES AND EVIDENCE

Sources and evidence

The explanation follows the evidence chain below. Links open the original source.

  1. 01
    Language control in bilinguals

    Supports a specific claim or evidence boundary used in this article.

    PEER-REVIEWED REVIEW ↗
  2. 02
    The bilingual brain: flexibility and control

    Supports a specific claim or evidence boundary used in this article.

    PEER-REVIEWED REVIEW ↗
  3. 03
    Neural control of two languages

    Supports a specific claim or evidence boundary used in this article.

    PEER-REVIEWED REVIEW ↗
CHANGE LOG28 Aug 2026 · First five-language edition; claims, evidence boundaries and visual model checked.