Fourteen participants ( aged 11 ; 3-16 ; 1 ) with severe RELI ( mean standard scores : CELF4 ELS = 48 , CELF4 RLS = 53 and TROG-2 = 57 ) , but higher non-verbal ( Matrices = 83 ) and visual perceptual skills ( Test of Visual Perceptual Skills ( TVPS ) = 86 ) were randomly assigned to two groups : therapy versus waiting controls .