icorporationidideas of referenceidentificationillogical thinkingillusionimplicitimplosion therapyimprintinginappropriate affectincoherenceindependent variableinduced motioninferenceinferential statisticsinsanityinsightinsomniainstinctsinstrumental aggressionintelligenceintelligence quotientinterferenceinternal consistencyinternalizationinterneuronirritability