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CHAPTERONE
HUMANCOGNITIVEABILITIESBASICCONCEPTUAL
ISSUES
Introduction
FLaptitudeisaconceptdeeplyrootedinSLAresearchtradition,butitsevolutionhas
alwaysbeensignificantlyaffectedbythedevelopmentofcognitivepsychology.Recent-
ly,theknowledgeofhumancognitiveabilitieshasexpandedowingtonewdiscoveries
inrelatedsciencessuchascognitivescience,geneticsandneurology.Thediscussionof
theroleofFLaptitudeinSLAwouldbeseriouslyimpoverishedifappliedlinguistsex-
cludedtheseimportantadvancesfromtheirresearchstudies.
Beforeexploringtheconstruct,itappearsnecessarytodefinebasicconceptscon-
nectedwithit,aswellastopresentitsbiologicalandenvironmentaldeterminants.The
chapterwillfirstintroducethebasicterms,namelycapacity,ability,aptitudeandper-
formanceinordertoclarifytheterminologicalconfusion.FLaptitudeisasetofcogni-
tiveabilities,whichisnotaself-containedunit,butconstitutesapartofageneralcog-
nitiveabilitymodel.Accordingly,thefollowingsectionswillpresentthediscussionof
theconceptofintelligence,definedasageneralcognitiveability,aswellasthemost
influentialhierarchicalmodelsofintelligence,thatisthoseproposedbySpearman
(1927),Vernon(1950),Cattell(1971),Jensen(1998)andCarroll(1993),andmulti-
-primary-factormodels,includingthosedevelopedbyThurstone(1938),Guilford
(1967),Gardner(1983)andSternberg(1985),withparticularemphasisonCarroll’s
(1993)CognitiveAbilitiesModelwhichisthemostrelevanttoFLaptituderesearch.
Carroll’s(1959)modelofFLaptitudeisgoingtobeaddressedatgreaterlengthinChap-
terTwo.Thiswillbefollowedbythepresentationofthemethodsofintelligencemeas-
urement.Attheonset,somespacewillbedevotedtoabriefpresentationofBinet’s
(Binet&Simon,1905)modelandtestofintelligence.Subsequently,theWechslerIntel-
ligenceScale(1997),whichisconsideredtobethemostinfluentialtestofintelligence,
willbediscussed.Thefocusofthechapterwillthenbeshiftedtothebiologicalbasisof
humancognitiveabilities,includinggeneticandneurologicalsourcesofdiversity,fol-
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