In my 895 I address the question of categorical effects in perception on three classes of phonemes: Vowels, Stop Consonants, and Fricatives. First, I explore previous work related to the categorical effects of vowels and stop consonants. Then, I review work on Fricatives and present my own work on behavioral and neural evidence for categorical effects in fricative perception. I proceed to review an existing model for the Perceptual Magnet Effect in vowels, and extend and generalize it for application to other classes of sounds. I present my own simulations of using this model to ac- count for categorical effects in both stop consonant and fricative perception. I show that the model provides both good fits, as well as derives appropriate values for all three sound types. Particu- larly, I am able to show that the ratio of meaningful category variance to perceptual noise variance is an important parameter in establishing the degree of categorical effects witnessed in behavioral studies conducted by myself and others. I conclude with remarks on the importance of bridging the gap between sound types and review ideas for future work to expand on current findings.