There is no problem with convergent evidence of various different measures correlating positively with general intelligence, which is also measured by IQ tests:

There is no problem with convergent evidence of various different measures correlating positively with general intelligence, which is also measured by IQ tests: 1. Reaction speed https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5608941/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5608941/ 2. Dendritic tree arborization, synaptic density, electrophysiological properties of pyramidal neurons https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6363383/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6363383/ There is a problem with sophistry and competitive virtue signaling around these phenomena. Instead of ignoring biology we could as well embrace it.