Learning disability ; EEG; Steady state topography; Steady state visually evoked potential; SSVEP; Electroencephalography ; Lexicon (neuroling.) ; Representation (semant.) ; Semantic representation ; Wortassoziation; Neighborhood (phonem.) ; Neighborhood (semant.) ; Verbal association ; Lexikalischer Zugriff; Lexical decision; Lexical access; Word recognition ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Wortbedeutung (Spracherwerb) ; Bedeutungsentwicklung; Semantic development ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Spanish