update readme

README.md

@@ -15,4 +15,4 @@ The planned labs are as follows:
 - [Lab 6: Detecting stress using biosignals](lab6)
 - [Lab 7: Measuring attention using cross-brain correlations](lab7)
 - [Lab 8: Detecting and controlling muscle movements](lab8)
-- Lab 9: Characterizing EEG responses to smell
+- [Lab 9: Characterizing EEG responses to smell](lab9)

lab9/README.md

@@ -1,7 +1,7 @@
 # Lab 9: Measuring brain response to different smells
 
 ### Introduction
-In this lab, we will record the different brain responses to various smells. 
+In this lab, we will record the different brain responses to various smells. We're particularly interested in alpha (8-13Hz) and beta waves (13-20Hz), but other ones may show up as well. 
 
 ### Setup