Map Term to Subject Heading is usually checked by default. Once you click Search, a MeSH tree will be revealed to you based on the context of your search term in relation to broader and more specific headings to help you narrow down your topic.
From there you have the option to:
Explode: retrieves citations using the selected term and all of its more specific terms.
Focus: limits your seach to those documents in which your subject heading is considered to be the major point of the article.
Choose Subheadings: Choose Include All Subheadings if you want all articles on your topic. Otherwise, you can choose limits and select the appropriate subheadings.
To execute a search:
Select a search type. In this example, Keyword is used. Advanced Searching mode in Ovid allows for the following search types: Keyword, Author, Title, Journal, Book Name
Type a term or phrase, depending on the search type you selected
|Click the Search button|
This research guide deals only with Ovid's Advanced Search mode. While its Basic Search runs on Natural Language Processing, Advanced Search uses command-line syntax and notation. These include the Boolean operators (see Venn diagrams of them below), truncation with wildcards (*), as well as limits (see Search History).
When combined with your search terms, field notations and the Boolean, Wildcard and Truncation commands, you can structure a query that is easily replicable and editable.
For a more detailed description of advanced searching techniques in Ovid, including Command Line Syntax, refer to Ovid's Resource Center. While use of Command Line Syntax is not absolutely required by Ovid's Advanced Search, it could be worthwhile to learn shortcut commands to bypass use of the icon bar.
Ovid processes search queries from left to right. To specify precedence, enclose terms and operators in parentheses within your search statement. You can nest and combine a search statement with the following Boolean operators:
retrieves any or all of the search terms [Example: heart attack OR myocardial infarction]
|AND||retrieves records with only both search terms [Example: blood pressure AND stroke]|
|NOT||excludes second term, only retrieves records for first [Example: health reform NOT health policy]|
|ADJ||searches for words adjacent to each other and only separated by a single space [Example: blood pressure or bloodADJpressure]|
|ADJn||searches for terms that are a specified number (n) spaces away from each other [Example: physician adj5 relationship]|
|FREQ||specify a term's threshold of occurrence in the records retrieved. The syntax for this is "x.fd./freq=n" where fd is the 2 letter field name, and n is the frequency. [Example: blood.kw./freq=5 ]|
|Use * , $ , or : at the end of a word, or part of a word to retrieve unlimited suffix variations [Example: disease* for diseases, diseased, etc]|
|Use # on the inside or at the end of a word to replace exactly one character [Example: wom#n]|
|Use ? inside or at the end of a word to replace zero or one character [Example: robot?]|