|Prospective memory, also referred to as memory for intentions, is the ability to remember to carry out a future task. Successful completion of a prospective memory task requires the ability to monitor time, keep the action to be performed in awareness periodically, remember the task to be performed, and initiate the action. The Memory for Intentions Test (MIST), a test of eight time-delayed prospective memory tasks, provides a comprehensive measure of many aspects of prospective memory functioning.
The MIST satisfies the criteria for a prospective memory test set out by Ellis and Kvavilashvili (2000): It has a delay between encoding and retrieval of the prospective task, there is no explicit prompt when the occasion to act occurs, and there is a separate ongoing activity. However, it expands on these requirements and separates itself from other prospective memory tests by including multidimensional tasks, analyzing the types of skills that may compromise performance, and being appropriate for individuals with neurological disorders.
MIST tasks were designed to measure the more everyday aspects of prospective memory performance. Thus, each MIST task is a real-world task that one might have to perform in daily life. MIST trials vary by cue type (time vs. event), time delay (long vs. short), and response type (action vs. verbal) for a comprehensive examination of prospective memory performance. The MIST also contains a Delayed Prospective Memory Task with a 24-hour delay, which enables you to approximate the examinee’s time span of actual memory for intentions in daily life.
Five types of errors can be analyzed. Prospective memory failure errors are scored if the examinee does not give any response. Task substitution errors are scored when the examinee performs an action for a verbal item or gives a verbal response for an action item. Loss of content errors are scored when the examinee recalls that a task needs to be completed at the correct time, but either cannot recall the task or recalls the incorrect task. Loss of time errors are scored when a subject recalls a task correctly but does so at the incorrect time. Finally, random errors are scored when the subject’s error does not fit into any discernible category.
Two forms (Form A and Form B) were developed to mitigate practice effects.
N.B. A red pen, tape recorder, postcard, envelope, and clipboard also are required for administration. These are not included in the kit.