? th?s ama, t? daoine ag smaoineamh, ag gn?omh? agus ag maireacht?il ar bhealach difri?il ?na ch?ile. Ar nd?igh ba mhaith le duine a fh?il amach c?n f?th go raibh daoine difri?il - c?n f?th go bhfuil cuid acu n?os cliste n? n?os eitici?la - agus an raibh aon rud a d'fh?g go raibh difr?ocht bhuan acu. D'fh?ach scol?ir? ar an gceist seo ar dh? bhealach. Mha?gh roinnt daoine go raibh bun?s fisici?il l?idir leis na difr?ochta?, rud a d'fh?g go raibh siad dosheachanta agus do-athraithe. Le himeacht ama, rinneadh na difr?ochta? fisiceacha l?omhnaithe seo n?os measa ag protuberances cranial (phrenology), m?id agus cruth an cloigeann (craniology), agus, inniu, g?inte.dh? Luaigh daoine eile an ?ags?lacht mh?r oili?na at? ag gach duine, a dtaith?, a n-oili?int n? a slite foghlama. B'fh?idir go mbeadh ionadh ort a fh?il amach gurbh ? Alfred Binet, aireag?ir na t?st?la chomhrann faisn?ise (IQ) duine de na daoine ba mh? a mhol an tuairim seo.3 An ? cusp?ir na trialach seo achoimre a dh?anamh ar fhaisn?is leana? nach bhfuil ag athr?? N?l i nd?ir?re. Bh? Binet, Francach a d'oibrigh i bP?ras ag t?s an 20? haois, ag iarraidh leana? nach raibh ag ?ir? leo foghlaim i scoileanna poibl? Ph?ras a aithint, chun go bhf?adfa? cl?ir oideachais nua a chruth? a chead?dh a dt?arnamh.
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