Negative spread or negative chain formation normally applies to indefinite quantifiers, which, as a result, take a negative form in the scope of negation. Thus: ningun hende [no one person] 'no one, nobody', nada 'nothing', nunka 'never', etc. These negative forms contribute quantificational force only, and not their negative meaning. Negative spread is considered normative, as seen in Maduro (1971: 47), which contains several examples of negatives which fail to display negative spread and which Maduro "corrects" to double negatives.
Source: nd: 20 June 2009, p.7
Source: Maduro 1971: 47