f&f &&#TNPP2OMiF & TNPP &&TNPP   f - "-- !f-- "-&9H&--v/v- $==DDw/w- $==DDy0y- $==DDz0z- $= = DD|1|- $ =(=(D D~2~- $(=0=0D(D3- $0=8=8D0D4- $8=@=@D8D5- $@=H=HD@D6- $H=P=PDHD8- $P=X=XDPD9- $X=`=`DXD:- $`=h=hD`D<- $h=p=pDhD>- $p=x=xDpD?- $x==DxDA- $==DDC- $==DDE- $==DDG- $==DDH- $==DDJ- $==DDL- $==DDN- $==DDP- $==DDR- $==DDS- $==DDU- $==DDW- $==DDX- $==DDY- $==DD[- $==DD\- $==DD]- $==DD^- $==DD_- $= = DD`- $ =(=(D Da- $(=0=0D(Db- $0=8=8D0Db- $8=@=@D8Dc- $@=H=HD@Dc- $H=P=PDHDd- $P=X=XDPDd- $X=`=`DXDe- $`=h=hD`De- $h=p=pDhDe- $p=x=xDpDf- $x==DxD $==DDe- $==DDe- $==DDe- $==DDd- $==DDd- $==DDc- $==DDc- $==DDb- $==DDb- $==DDa- $==DD`- $==DD_- $==DD^- $==DD]- $==DD\- $==DD[- $==DDY- $==DDX- $==DDV- $= = DDU- $ =(=(D DS- $(=0=0D(DQ- $0=8=8D0DP- $8=@=@D8DN- $@=H=HD@DL- $H=P=PDHDJ- $P=X=XDPDH- $X=`=`DXDF- $`=h=hD`DE- $h=p=pDhDC- $p=x=xDpDA- $x==DxD?- $==DD>- $==DD<- $==DD:- $==DD9- $==DD7- $==DD6- $==DD5- $==DD4- $==DD3- $==DD~2~- $==DD|1|- $==DDz0z- $==DDy0y- $==DDw/w- $==DDv/v- $==DD---& "--E=--&&$&--- $ $$$- $ $ $ $- $---&& - @Times New Roman- . 2 1.--; -- @Times New Roman- .2 +)Summary.--gi-- @Times New Roman- . 2  .@Times New Roman- .?2 %We present experimental evidence for          .@Times New Roman- .2 three  . "--%-- '@Times New Roman- %.2 .cholinergically   . %. 2 - . %.X2 6induced oscillatory regimes in the hippocampal slice.           . %.<2 #Frequencies are within the delta        .@Times New Roman- %. 2 (.5 . %. 2 - . %. 2 2Hz) .@Times New Roman- %.2  , theta    .@Times New Roman- %. 2 m(5 . %. 2 - . %.2 10Hz) .@Times New Roman- %.2  and gamma    .@Times New Roman- %. 2 (40 . %. 2 - . %.2 70Hz) .@Times New Roman- %.-2 3bands, and depend on the       . %.%2 concentration of the     . %.2 neuromodulator    . %.%2 (carbachol) applied.     . %. 2 a . %. 2 aCCH. %. 2 aW- . %.2 aa theta and CCH   . %. 2 a- . %.@2 a&delta are initiated in CA3 and depend           . %.C2 (essentially on AMPA receptor activation.      . %. 2  . %. 2 CCH. %. 2 W- . %.K2 a-theta involves the synchronous firing of CA3            . %.f2 ?pyramidal cells, at most once per cycle, while the majority of                . %. 2 CA3 . %.2 G interneurons     . %.2 fire  . %.2  tonically  . %.$2 (at theta) in a non    . %. 2 X- . %.%2 8synchronized manner.      .-- "System-&TNPP &