Figure 6.

Changes in single unit firing during and following pup contact. Top) Proportion of units showing increased and suppressed firing responses (FR) during pup contact and rearing activity. Middle) Proportion of units showing increased firing during the expression of either pup contact or rearing activity (timed) and units showing changes following the expression of these behaviors (prolonged). A contingency test showed significant differences between pup contact and control units (χ² = 9.7, p = 0.002). Bottom) Proportion of single units that are responsive during pup contact and upright movement, subdivided into animals showing retrieval or that failed to do so. A significantly greater proportion of units responsive during pup contact belonged to the non retrieving maternal animals (χ² = 4.5, p = 0.03).