Typos

This chapter has several typos in it. In fact this entire 6th edition has more typos and other sorts of errors than previous editions. But it's still my favorite textbook, by a long shot.

Anyway, in some of the diagrams showing discrimination, the label for the S^Δ box is S^D rather than S^Δ. That's not too bad and I think most students either see it and understand that it's just a typo or, in many cases they don't even notice it.

More important, though, is the error in the paragraph right before the diagram on p. 205. The boldface "punishment-based S^D" should actually say "punishment-based S^Δ." In this example, the mild temperature "signals" that the punishment contingency is NOT in effect, and that's the function of an S^Δ.

On p. 206, 2nd column, next-to-last paragraph, the 6th line should say "reinforcement-based S^Δ" instead of "reinforcement-based S^D."

On p. 214 both diagrams show S^D in the box below the Behavior box. In both cases that should be S^Δ instead.

The diagram on p. 216 has the same problem.