 Second, consider the contents of speech perception. Does the content of speech perception differ from that of ordinary audition? If it does, how does the experience of perceiving speech differ from that of hearing ordinary sounds? Perceiving speech might involve hearing ordinary sounds but auditorily ascribing distinctive features to them. These features might simply be, or comprise, finer grained qualitative and temporal acoustical details than non-linguistic sounds audibly possess. But perceiving speech also might involve perceiving sounds as belonging to language-specific types, such as phonemes, words, or other syntactic categories.