Brain Activity during Episodic Retrieval of Autobiographical and Laboratory Events: An fMRI Study using a Novel Photo Paradigm

TLDR

Functional neuroimaging of episodic memory typically contrasts laboratory items with autobiographical events, and differences in activation may reflect retrieval processes, memory remoteness, emotional content, self‑referential processing, visual/spatial memory, and recollection. The study aimed to clarify how these conditions differ by examining brain activity during episodic retrieval. Using a novel photo paradigm, undergraduate students photographed campus scenes for a controlled autobiographical condition, viewed similar photos from other participants as a controlled laboratory condition, and were scanned while recognizing both types of photos, allowing measurement of retrieval accuracy. Both conditions engaged a common episodic memory network, but the autobiographical condition produced greater activity in medial prefrontal, visual and parahippocampal, and hippocampal regions, demonstrating that the photo paradigm can probe real‑life episodic memory under rigorous experimental control.

Abstract

Abstract Functional neuroimaging studies of episodic memory retrieval generally measure brain activity while participants remember items encountered in the laboratory (“controlled laboratory condition”) or events from their own life (“open autobiographical condition”). Differences in activation between these conditions may reflect differences in retrieval processes, memory remoteness, emotional content, retrieval success, self-referential processing, visual/spatial memory, and recollection. To clarify the nature of these differences, a functional MRI study was conducted using a novel “photo paradigm,” which allows greater control over the autobiographical condition, including a measure of retrieval accuracy. Undergraduate students took photos in specified campus locations (“controlled autobiographical condition”), viewed in the laboratory similar photos taken by other participants (controlled laboratory condition), and were then scanned while recognizing the two kinds of photos. Both conditions activated a common episodic memory network that included medial temporal and prefrontal regions. Compared with the controlled laboratory condition, the controlled autobiographical condition elicited greater activity in regions associated with self-referential processing (medial prefrontal cortex), visual/ spatial memory (visual and parahippocampal regions), and recollection (hippocampus). The photo paradigm provides a way of investigating the functional neuroanatomy of real-life episodic memory under rigorous experimental control.