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Incorporation of [1H]fucose into the TCA‐precipitable material from the particulate and soluble fractions of different regions of the brain in the 1‐day‐old chick was measured following training on a passive avoidance task. A significant increase in the level of incorporation of [3H]fucose into the particulate fraction of the anterior forebrain roof was observed in the trained birds as compared with untrained controls. The percentage increases in radioactivity in the particulate fraction of the anterior forebrain roof were 29% (p < 0.01), 16% (p < 0.01), and 26% (p < 0.01) in the trained birds as compared with controls, 30 min, 3 h, and 24 h following learning, respectively, but had returned to control levels after 48 h. These results suggest either increased production of glycoproteins or increased fucosylation of preexisting proteins following training, and suggest one of the possible localized neurochemical changes associated with the learning of the passive avoidance response.

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