Comparison of RF properties of excitatory neurons between the transgenic and wild-type mice. A, Distribution of OI. n = 17 and 25 (from left to right). p = 0.61, t test. B, Distribution of subfield size. n = 20 and 37. p = 0.87. C, Distribution of global OSI. n = 33 and 33. p = 0.65.