Create a professional, landscape-format neuroscience research poster for the Society for Neuroscience annual meeting. Use a clean white background, minimal text, bold scientific headlines, and an elegant three-column layout. The study investigates how successive climbing fiber activations influence timing-dependent LTD at parallel fiber–Purkinje cell synapses. Preserve all original electrophysiology traces, six experimental graphs, labels, and numerical results without modification. Highlight the comparison between single and double climbing fiber activation. Include an attractive Purkinje cell schematic, experimental timeline, and a prominent key findings section. Make the entire poster editable in PowerPoint.