Which instructional strategy detracts from effective orthographic mapping?

The correct choice highlights that reading new words silently can detract from effective orthographic mapping. Orthographic mapping is the process by which learners connect sounds to letters and letter patterns to create a permanent representation of words in memory, which is crucial for reading fluency and understanding.

When reading new words silently, learners may not engage with the phonetic and visual elements of the words as deeply as they would if they were vocalizing them. This lack of vocalization can lead to a weaker connection between the sounds and their corresponding letters and letter patterns. In contrast, other strategies such as reading aloud, practicing spelling in context, and engaging in collaborative activities using word patterns promote active engagement with the words, helping to solidify the understanding and retention of their spellings and meanings.

By vocalizing new words, learners reinforce their phonemic awareness and improve their ability to remember how to spell and read these words in the future, thereby enhancing their orthographic mapping skills.