(a) Retrieval activity in DG/CA3 (χ2(1) = 37.03, p < 10−9), CA1 (χ2(1) = 23.16, p < 10−6), and Sub (χ2(1) = 15.29, p < 10−5) is a significant predictor of associative retrieval success. This relationship varies in strength across subfields (χ2(1) = 12.99, p < 0.001), with DG/CA3 activity being a significantly stronger predictor than CA1 (z = 2.31, p < 0.05) or Sub (z = 3.55, p < 0.001), whereas CA1 and Sub do not significantly differ (z = 1.24, p > 0.21). (b) Category-level reinstatement strength in VTC is related to activity in all subfields (DG/CA3: χ2(1) = 12.25, p < 0.001; CA1: χ2(1) = 15.40, p < 10−5; Sub: χ2(1) = 13.38, p < 0.001; interaction: p = 0.703). Subfield activity is no longer a significant predictor of VTC category-level reinstatement when considering associative hit trials only (DG/CA3: p = 0.748; CA1: p = 0.175; Sub: p = 0.504). (c) Category-level reinstatement strength in ANG is related to activity in DG/CA3 (χ2(1) = 7.89, p = 0.005) and CA1 (χ2(1) = 10.49, p = 0.001), but not Sub (p = 0.458); DG/CA3 and CA1 effects do not differ (p = 0.988). When considering associative hit trials, only DG/CA3 remains marginally significant (χ2(1) = 2.86, p = 0.091; CA1: p = 0.437; Sub: p = 0.572). For visualization, data for each participant are binned into quintiles based on hippocampal subfield activity. Statistics were conducted on trial-wise data, z-scored within participant. Error bars represent standard error of the mean. VTC = ventral temporal cortex; ANG = angular gyrus; DG = Dentate Gyrus; Sub = Subiculum.