Hi,
I'm a Child Psychologist, and I do cognitive and educational, and some language assessments all the time.
Rapid Naming difficulty is basically a difficulty retrieving words fast, or coming up with words for what a child wants to express fast. It looks like the child is struggling to express what he wants to say. He usually has a hard time summarizing things, and gets stuck in telling things his own way, in round about detailed explanations. When he is talking about what he wants to talk about, using his own words, he can usually do fine. But when under a formal language demand, like being asked a question in a classroom, it takes longer to come up with the words or phrases. Rapid Naming difficulties are highly correlated with Dyslexia. In dyslexia, among other things, the child has a hard time becoming a fluent reader. "Fluent" is the part that is correlated with rapid naming. Fluently coming up with words, or recognizing what the word is when he sees the symbols (letters). One thing that contributes to difficulties with retrieval, including rapid naming, is poor organization. When the child's words are organized in his memory in a very disorganized fashion, it's harder to quickly go into his memory and find the right word. It's like trying to find a paper in a disorganized filing cabinet. So, one thing that can help, is to help the child's word knowledge become more organized. There are lots of activities you can do to help. Like making "word thermometers" in which you make a list of related words from mild to extreme, like, cold, warm, hot, burning, scalding; or annoyed, bothered, mad, angry, furious, etc. Arrange them from bottom (mild) to top (extreme), like a thermometer, and they can be color coded, like pale pink to hot red. Lots and lots of word groups can be arranged like this. Also, you can create a "word wall" in which words are placed in some organized way showing how they relate to each other. Add pictures. Be creative. Another technique is to put individual words on post-its. Then put higher-order concepts on a big piece of butcher paper and arrange the post-its in ways that relate to the concepts. Like "colors", with "red", "blue", etc underneath. This is a simple example, but the technique can be used all the way up to writing research papers in high school. Post-its with words, or facts, then arranged according to some organizational scheme. Also, you can take the simple words or concepts, put them all together, and ask the child for one word or phrase that summarizes all those words. The possibilities are endless. The point is to get words into their brain in a more organized fashion so that they can be accessed more easily.
Also, if there are common phrases that your child needs to be able to produce fast, teach them to him and practice them. Like "i need help" or "which way to a telephone". Lame examples, but in new situations you can sometimes anticipate some phrases he might need and get them ready for him to be able to access faster when he needs them.
With low rapid naming scores, I hope you have had your child evaluated for dyslexia, a type of developmental reading disability. Hope this all helps. I'd love to hear if it does or not. Good luck. ____@____.com