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<h1></h1><div></div><div>Intriguingly we noticed that even for excitatory responses, the amplitude of the transient seemed to be dependent on the baseline level at the time of stimulation (figure SXX).</div><div>Delta 7 as a bottleneck. Role of inhibition in the ring attractor ?</div><div>Gain control at the input stage is a generalized motif in the CX ?</div><div>Inputs in the NO : what are they for ?</div><div>The output channel is very narrow : possible consequences ?</div><div>Optional : network motifs ?</div><h1 data-label="249564" class="ltx_title_section">Material and methods</h1><h2 data-label="398564" class="ltx_title_subsection">Fly stocks and crosses</h2><div>For every LexA driver used, we prepared two stocks containing GCaMP6-m <cite class="ltx_cite raw v1">\cite{chen_ultrasensitive_2013}</cite> and CsChrimson <cite class="ltx_cite raw v1">\cite{klapoetke_independent_2014}</cite> under LexAop (resp. UAS) or UAS (resp. LexAop) control : <i>XXX-LexA;13XLexAop2-IVS-p10-GCaMP6m 50.629 in VK00005, 20xUAS-CsChrimson-mCherry-trafficked in su(Hw)attP1</i> and <i>XXX-LexA;20xUAS-IVS-GCaMP6m 15.629 in attP2, 13XLexAop2-CsChrimson-tdTomato in VK00005</i>. Those stocks were then crossed to a Gal4 driver or a split-Gal4 <cite class="ltx_cite raw v1">\cite{luan_refined_2006}</cite> driver for the experiment. In the split-Gal4 case, the two split halves are inserted in attP40 and attP2 respectively. To avoid transvection between the split and the LexA driver <cite class="ltx_cite raw v1">\cite{mellert_transvection_2012}</cite>, we inserted the LexA drivers in alternative sites, either su(Hw)attP5 <cite class="ltx_cite raw v1">\cite{pfeiffer_refinement_2010}</cite>&nbsp;or VK22 <cite class="ltx_cite raw v1">\cite{venken_pacman:_2006}</cite>, and used the splits exclusively in combination with those lines. The list of drivers used and the corresponding cell types are given in Table &nbsp;<span class="au-ref raw v1">\ref{786393}</span>. We generally follow the nomenclature proposed in&nbsp;<cite class="ltx_cite raw v1">\cite{wolff_neuroarchitecture_2015}</cite>.</div><div></div>