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Description: This study examined whether early effects of semantics could occur in the context of the PRP paradigm. Based on Reynolds and Besner (2004), it was predicted that early effects of semantics would possibly be observed. The study found that the difference in reaction times for the related and unrelated primes for the secondary lexical decision task were constant at the varying SOAs. This additive effect, using the locus-of-slack logic, means that semantic information occurs at or after the central processing bottleneck. Thus, the results did not lend support for our prediction, as semantic information did not feedback to letter representations. The results of this study thus contradict Reynolds and Besner’s (2004) position that the letter level receives information from the semantic and lexical levels. Johnston, McCann, and Remington’s (1995) position, on the other hand, is completely in line with the current data of this study. Their theory that words and semantic occur at or after central processing accounts for the additive effects observed in this study. The current study found that the faster related prime trials in the secondary lexical decision task remained as fast in the short SOA as compared to the long SOA. Thus, the additive effect found lends support that semantic analysis occurs at or after the central attention bottleneck. Although early effects of semantics were not found in the current investigation, one can only imagine that one day researchers may be able to show semantic processing occurring simultaneously with other cognitive tasks.