Dae bilingual fowk dae better on the Stroop test?

The Stroop-specific estimate is in Table 3. It is a standardised difference, no 12% better performance or a probability for ane person. The table's sma unadjusted effect and the paper's bias-adjusted conclusion maun be read thegither; pickin oot juist the positive cell wad misrepresent the review. Lehtonen et al., 2018

Wha wis an advantage proposed?

Handlin mair nor ae leid gies an intuitively plausible reason tae study cognitive control. But plausible mechanisms need direct evidence. Paap and Greenberg's empirical wark questions whether several executive tasks gie coherent evidence for ae bilingual advantage, instead o ettlin that a shared label maks their scores equivalent. Paap et al., 2013

The Stroop task itsel haes several pairts an pieces. Wirds, colours, response mappings and the chosen baseline influence its cost. MacLeod's review and the clinical measurement review shaw why it cannae be reduced tae a pure, leid-independent control meter. MacLeod, 1991 Scarpina et al., 2017

Dae the test leid matter?

A written wird can interfere anerlie through the processes it engages in the reader. The original task shawed the relevance o a familiar verbal response, while the reviews describe differences atween task versions. That backs up keepin leid and response conditions the same; it disnae gie a single bilingual correction factor. Stroop, 1935 MacLeod, 1991

Group differences cannae identify an individual

E'en an observed sma group difference wad leave a lot o overlap and wadnae explain why ae person's score changed. The reliability-paradox study anaw shawes that mony classic task differences are less reliable for rankin individuals than their robust experimental effects micht suggest. A short browser run cannae establish whit leid experience caused a result. Hedge et al., 2017

The adult synthesis disnae establish universal age-by-age or sex-specific Stroop norms for bilinguals. Its conclusion shouldnae be extended automatically tae bairns, ilka pair o leids, or ilka definition o bilingual experience. A different population needs its ain suitable evidence. Lehtonen et al., 2018

Why measurement and adjustment matter

Browser timing varies atween systems, and Stroop scorin varies atween test versions. Clinical meta-analytic wark illustrates how the method uised tae measure interference can change the apparent size o group effects. This is a general warnin aboot measurement, no evidence that bilingualism is a clinical condition. Anwyl-Irvine et al., 2020 Lansbergen et al., 2007

Whit can ye realistically infer fae giein it a try?

Uise the test as an experience o conflictin wird and colour information. Gin ye compare yer ain runs, keep leid, device, response mode and scorin fixed. Read error rates thegither wi response times and dinnae interpret a change as proof o a broad bilingual benefit. Scarpina et al., 2017 Hedge et al., 2017

The evidence disnae argue against lairnin leids, nor mak a promise o cognitive enhancement for daein sae. It answers a mair narrae question: the cited adult literature disnae gie robust support for a general executive advantage efter takkin publication bias intae account. Specific leid skills and the value o communicatin in anither leid are separate outcomes. Lehtonen et al., 2018 Paap et al., 2013