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. 2021 Aug 24;26(12):7200–7210. doi: 10.1038/s41380-021-01240-9

Fig. 5. Experiment 2.

Fig. 5

Relationship between extent of depletion and degree of Pavlovian reversal learning impairment. The correlation was significant. ΔTRP:LNAA is the change in the ratio of tryptophan to large neutral amino acids; y = 0 indicates no change. A greater change (post-depletion blood minus pre-depletion results) in the TRP:LNAA ratio indicates a more extensive depletion (more negative y-axis values). Reversal learning is indexed here as the difference score between CS+ and CS− in the reversal phase. Increasing x-axis values represent better discrimination learning assessed by SCR between the CS+ and CS− in the reversal phase (i.e. better reversal learning). Shading indicates ±1 standard error (SE).