A simple 2-transistor touch or lick detector circuit. <meta name="Title" content="A simple 2-transistor touch or lick detector circuit."> <meta name="Author" content="Slotnick, B."> <meta name="Volume" content="91"> <meta name="Number" content="02"> <meta name="StartPage" content="253"> <meta name="Pages" content="253-256"> <meta name="Year" content="2009"> <meta name="JournalNameShort" content="JEAB"> <meta name="JournalName" content="Journal of Experimental Analysis of Behavior"> </head> <body> <a href="/jeab/login/login.php"><IMG SRC="/pics/subscribe_or.jpg"></a> <H2> Slotnick, B. (2009). A simple 2-transistor touch or lick detector circuit. <i> Journal of the Experimental Analysis of Behavior, </i> <B>91</B>, 253-256.</H2> An easily constructed and inexpensive battery operated circuit is described for use as a lickometer or contact detector in behavioral studies with rodents. <P>Key words: touch circuit, lickometer, contact detector</P> </body> </HTML>