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SESSIONS CHRONIC (-)NICOTINE 0.8 mg/ko 



45 



jl 60 72 to 90 



Figure 7^ Effects of daily administration of 0.3 mg/kg of nicotine on FR 32 

 response rates during the total 30 minute session (top) and during 

 the first six minutes of the session (bottom). The before group 

 received nicotine before and saline after the session; tjte after 

 group received saline before and nicotine after-the session. On day 

 31 both groups received nicotine before and saline after the 

 session. Each point is based upon the data from seven rats; 

 vertical lines indicate 1 S.E.. Points above S represent saline 

 control responding; the mean is indicated by 100% on the ordinate. 

 Saline control points are the mean of five consecutive saline 

 sessions which immediately preceeded chronic nicotine administra- 

 tion. 



