Twenty dogs are initially presented with numerous cs-tone/us-footshock pairings. these dogs are then placed in a shuttle box, and movement from one side of the shuttle to the other terminates periodic presentations of the cs tone. no shocks are delivered in the shuttle box. this is an example

What is the difference between a journal entry written by an eyewitness to an event and a play written about the same event? a. the journal entry is a historiographical source, while the play is a periodical source. b. the journal entry is a chronological source, while the play is a primary source. c. the journal entry is a primary source, while the play is a secondary source. d. the journal entry is a secondary source, while the play is a periodical source.