Pigeons''coding of event duration in delayed-matching-to-sample

Publisher Summary This chapter discusses pigeons' coding of event duration in delayed matching-to-sample. The delayed matching-to-sample (DMTS) task is the primary analytical tool used to investigate working memory processes in pigeons. The DMTS task is typically implemented in a conditioning chamber containing a row of three pecking keys which can be illuminated by various stimuli (colors, geometric forms, lines in various orientations). The focus in the chapter is the analysis of working memory processes used by pigeons to remember event duration (e.g., 2 or 10 s of light presentation) in symbolic DMTS. Of primary interest is the nature of the working memory representation or code employed to mediate accurate performance following a delay. The chapter addresses the nature of working memory representations in DMTS tasks in which the samples differ in duration. In the standard choice version of the DMTS task, in which each duration sample is mapped in a one-to-one relation to a comparison stimulus, naive pigeons code samples retrospectively and analogically.

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