Please check out the Genesis Group at MIT's CSAIL. Or Patrick Winston's Strong Story Hypothesis. Or Bob Berwick. Many at MIT are still working through the 80's winter, without the confirmation bias of Minsky and Papert's Perceptrons with all the computation power and none of the theory (now called neural nets). Or any of the papers here: https://courses.csail.mit.edu/6.803/schedule.html

Or the work of Paul Werbos, the inventor of backpropagation, was heavily influenced by -- though itself perhaps outside the cannon of -- strictly symbolic approaches