 Other studies have been conducted about the cognitive effects of Sesame Street . In 1990 , a two @-@ year longitudinal study found that viewing the show was a " significant predictor " of improved vocabulary regardless of family size , parent education , child gender or parental attitudes towards television . Another study conducted in 1990 looked at the effect of Sesame Street home videos and discovered gains in vocabulary , letter , and printed- and spoken @-@ word identification . The videos encouraged discussion with adults , which may have helped reinforce educational messages and content . 
