A day in the life of PubMed: analysis of a typical day's query log.

OBJECTIVE: To characterize PubMed usage over a typical day and compare it to previous studies of user behavior on Web search engines. DESIGN: We performed a lexical and semantic analysis of 2,689,166 queries issued on PubMed over 24 consecutive hours on a typical day. MEASUREMENTS: We measured the number of queries, number of distinct users, queries per user, terms per query, common terms, Boolean operator use, common phrases, result set size, MeSH categories, used semantic measurements to group queries into sessions, and studied the addition and removal of terms from consecutive queries to gauge search strategies. RESULTS: The size of the result sets from a sample of queries showed a bimodal distribution, with peaks at approximately 3 and 100 results, suggesting that a large group of queries was tightly focused and another was broad. Like Web search engine sessions, most PubMed sessions consisted of a single query. However, PubMed queries contained more terms. CONCLUSION: PubMed's usage profile should be considered when educating users, building user interfaces, and developing future biomedical information retrieval systems.

Narrated PowerPoints and Audio Podcasts in Clinical Teaching: One Clerkship's Experience

Introduction: Clinical medical education is increasingly utilizing novel technological approaches in order to supplement traditional lecture-based didactics. The Neurology Core Clerkship at Baylor College of Medicine is a four week required course taken by clinical medical students. Given the large amount of information to be disseminated in a short period of time, part of the didactic material has been provided online in the form of narrated PowerPoint files or lecture audio tracks along with stand-alone PowerPoint files. The narrated files are generated using the native PowerPoint narration function while the stand-alone audio files are created as MP3 format files using an inexpensive digital recording device. [See PDF for complete abstract]