We uploaded electrophysiological data collected from the lateral intraparietal area (LIP) of two macaque monkeys when they performed a probabilistic reasoning task. The relevant paper (Evidence accumulation occurs locally in the parietal cortex, https://doi.org/10.1038/s41467-022-32210-6) is published in Nature Communications. The description of the data and codes for reproducing results in the paper can be found at https://github.com/zwzhangi36/sensory-evidence_transformation_in_LIP .