A photoplethysmographic sensor designed for use on the presenting portion of a fetus during labor and delivery. A search for a fixed codebook contribution and an adaptive codebook contribution for subframe units is conducted. A first restricting member is arranged on one side of the output end of the first feeder slot. A sentiment index is determined based upon the aggregated volatility score for each of the plurality of accounts. In another aspect of the present invention, a second electronic component is coupled to a second side of the PCB. The memory controller can be configured to buffer incoming requests, prioritize the requests into a final order, and submit the requests to the memory in the final order.