On- and Off-centre Pathways in a Retino-Geniculate Spiking Neural Network on SpiNNaker**This work is supported by the Science and Engineering Research Board of India (SERB) Core Research Grant CRG/2019/003534, BITS Pilani Institutional Research Grants GOA/ACG/2019-20/Oct/02 and BPGC/RIG/2018-19. TSG is supported by EU grant PCI2019-111826-2 “APROVIS3D”, by Spanish grant from the Ministry of Science and Innovation PID2019-105556GB-C31 “NANOMIND” (with support from the European Regional Development Fund) and by the CSIC 2018-50E008 AVE project.