(In mammals) neurons lace the gut and other organs, and are implicated both in cognition and recall. For example Damasio's Somatic Marker Hypothesis holds that

(In mammals) neurons lace the gut and other organs, and are implicated both in cognition and recall. For example Damasio's Somatic Marker Hypothesis holds that affective decision making 'polls' physiological responses which direct affect, providing intuitive 'system 1' information to aid decision making. There's a whole field of embodied cognition which studies the interaction of the body and brain / central nervous system in behaviour and decision making. While all this is a far cry from regenerating memories in the sense we think of them; the authors are merely referring to conditioned information, which could certainly be stored in the extra-cortical nervous system.