Cognitive psychology

Psychoanalysis

Neuroscience

Confusion

Cognition

Visual perception

Sensory system

Reality testing

Neural correlates of consciousness

Computer science

Virtual reality

Cognitive science

Psychology

Metacognition

Perceptual Disorders

Perception

Human–computer interaction

Neuroscience & Biobehavioral Reviews

There is increasing evidence that imagination relies on similar neural mechanisms as externally triggered perception. This overlap presents a challenge for perceptual reality monitoring: deciding what is real and what is imagined. Here, we explore how perceptual reality monitoring might be implemented in the brain. We first describe sensory and cognitive factors that could dissociate imagery and perception and conclude that no single factor unambiguously signals whether an experience is internally or externally generated. We suggest that reality monitoring is implemented by higher-level cortical circuits that evaluate first-order sensory and cognitive factors to determine the source of sensory signals. According to this interpretation, perceptual reality monitoring shares core computations with metacognition. This multi-level architecture might explain several types of source confusion as well as dissociations between simply knowing whether something is real and actually experiencing it as real. We discuss avenues for future research to further our understanding of perceptual reality monitoring, an endeavour that has important implications for our understanding of clinical symptoms as well as general cognitive function.

Perceptual reality monitoring: Neural mechanisms dissociating imagination from reality