Recency and Primacy Effect | Jingkai Honghttps://jingkaihong.netlify.app/tag/recency-and-primacy-effect/Recency and Primacy EffectWowchemy (https://wowchemy.com)en-usSun, 23 Nov 2025 00:00:00 +0000https://jingkaihong.netlify.app/media/icon_hucbde1a20235b5cb75c554ae0daae2535_146828_512x512_fill_lanczos_center_3.pngRecency and Primacy Effecthttps://jingkaihong.netlify.app/tag/recency-and-primacy-effect/Early and Late Information Biases in Evidence Accumulation for Decision Makinghttps://jingkaihong.netlify.app/publication/hong_2025b/Sun, 23 Nov 2025 00:00:00 +0000https://jingkaihong.netlify.app/publication/hong_2025b/<!-- ### abstract Across three datasets (N = 150) involving choices with dynamic visual stimuli, we examined how early and late information contributes to decision outcomes. We present analysis techniques that measure and visualize the relative weight given to incoming information throughout deliberation. There is consistent over-weighting of early information (primacy). Recency effects were present in all tasks employing free-response conditions, but over-weighting peaked several hundred milliseconds before a response was made, then rapidly reduced, with later incoming information having no detectable influence upon choice. This pattern is consistent with non-decision time after a choice is formed and in preparation of a motor response. We demonstrate this apparent recency bias can be produced even by standard Drift Diffusion Models. However, eye-tracking data shows the timecourse is incompatible with visual attention accounts and the gaze cascade phenomena. Recency effects vanished under the complete-observation condition, a pattern incompatible with memory and evidence decay accounts. --> <h3 id="talk-presented-at">Talk presented at</h3> <ul> <li> Subjective Probability Utility and Decision Making (SPUDM) (Presentation), Lucca, 2025 </li> </ul> <div class="alert alert-note"> <div> Manuscript under review at <em>Psychological Science</em>. </div> </div>