Related Experiment Video
Updated: Aug 28, 2025
Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation
Published on: May 12, 2014
Cortical activity involved in perception and imagery of visual stimuli in a subject with aphantasia. An EEG case
Mariano Furman1, Pablo Fleitas-Rumak2, Pilar Lopez-Segura1
1Departamento de Medicina Legal Psiquiatría y Patología, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain.
Abstract:
Aphantasia has been described as the inability to voluntarily evoke mental images using the "mind's eye." We studied a congenital aphantasic subject using neuropsychological testsand 64 channel EEG recordings, in order to studycortical activity involved in perception and imagery evaluating event-related potentials(N170, P200, N250). The subject is in the normal range of the neuropsychological tests performed, except for specific imagery tests. The EEG results show that when he evokes the same mental image, he starts the evoking process from left temporal instead of frontal areas, he does not activate occipital visual nor left anterior parietal areas.
Related Concept Videos
01:23Brain Waves
01:14Motor and Sensory Areas of the Cortex
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....