I read/write multiple genres; I think multiple genres has a likely negative effect.
      I read/write multiple genres; I think multiple genres has a likely positive effect.
      I read/write multiple genres; I think multiple genres has likely no effect.
      I read/write one primary genre; I think multiple genres has a likely negative effect.
      I read/write one primary genre; I think multiple genres has a likely positive effect.
      I read/write one primary genre; I think multiple genres has likely no effect.