Susceptibility to External Memory Store Manipulation: The Influence of Perceived Reliability of and Expected Access to an External Store

Offloading memory to external stores (e.g., a saved file) allows us to evade the limitations of our internal memory. One cost of this strategy is that the external memory store used may be accessible to others and, thus, may be manipulated. Here we examine how reducing the perceived reliability of an external memory store and manipulating one’s expectation for future access to such a store can influence participants’ susceptibility to its manipulation (i.e., endorsing manipulated information as authentic). Across three pre-registered experiments, participants were able to store to-be-remembered information in an external store. On a critical trial, we surreptitiously manipulated the information in that store. Results demonstrated that an explicit notification of a previous manipulation of that store and the warning that the store will be inaccessible in the future can decrease susceptibility to manipulation of that store. Results are discussed in the context of the metacognitive monitoring and control of memory reports in situations that involve the distribution of memory demands across both internal and external spaces