When the eye is "adducted" (looking toward the nose), the force of depression increases. Having both vocal folds stuck in an adducted or closed position compromises the airway significantly. Resonant voice is produced with minimally adducted (closed) vocal folds. This is most common when the femur is adducted and internally rotated. Females with this defect may have adducted thumbs or subnormal intelligence. The supraspinatus muscle initiates abduction from a fully adducted position. As a result, the baby's shoulder girdle is adducted and the diameter is reduced. Because of this capture of an adducted electron pair, dihydridoiron has Lewis acidic character. Because of this capture of an adducted electron pair, dihydridochromium has Lewis acidic character. Because of this capture of an adducted electron pair, hydridoiron has Lewis-acidic character. When the eye is adducted, the oblique muscles are the prime vertical movers. The field of maximal inferior oblique elevation is in the adducted position. During prephonation, the vocal folds move from the abducted to adducted position. The adducted vocal folds do not close completely but instead remain partially open. Most males born with this have severe hydrocephalus, adducted thumbs, spastic motions, and intellectual problems.