Mark 4:15 and Luke 8:12, are clear that these birds represent Satan, and Mark says the devil comes immediately to steal away the Word. Satan did not have direct access to the Word in any of the other heart-types which Jesus described. Satan cannot steal the Word from us if we will hide it in our hearts (Psalm 119:11). This first type of person simply heard the Word but didn't receive it. He never applied it to his life, so he lost it.
Luke links belief and salvation with the Word being sown in our hearts in the same way as Romans 10:14-17. If there is no Word, there cannot be any belief or salvation (I Peter 1:23). We must preach the Word (not just morality or social issues).
Luke's use of the word "saved" includes, forgiveness of sins. Salvation includes much more than forgiveness of sins. This verse could describe a person who didn't receive the Word and was eternally damned. It could also be describing a Christian who simply doesn't receive the Word in a certain area of his life and doesn't experience the victory that Jesus provided for him.