Poster B112, Sunday, March 26, 8:00 – 10:00 am, Pacific Concourse
Tactile Enumeration and Brain Plasticity in Acalculia
Zahira Ziva Cohen1, Isabel Arend1, Kenneth Yuen2, Ronel Veksler1, Sharon Naparstek1, Yarden Gliksman1, Avishai Henik1; 1Ben-Gurion University of the Negev, Beer Sheva, Israel, 2Johannes Gutenberg University Medical Center, Mainz, Germany
The ability to enumerate is one of the building blocks of arithmetic and fingers are used in the early steps of this process. We explored tactile enumeration (TE) with fingers as the input surface, and voxel-based morphometry (VBM) to study gray matter changes of an acalculic participant—NO, a 22-year-old female with acalculia following a stroke to the left intraparietal sulcus. NO and a group of neurologically healthy controls reported how many fingers were stimulated. NO was tested at four time points: one month after the infarct (acute phase), one month later, half a year later, and a year and a half later. For the sensory intact hand, only in the acute phase was NO less accurate than controls. The RT slope of enumerating up to four stimuli was significantly steeper than that of controls in the acute phase but not in the subsequent time points. VBM analysis applied to acute phase and half a year later showed an increase in gray matter for NO relative to controls in the inferior occipital cortex during both phases. Her performance and neuro-anatomical changes serve as a first glance of tactile enumeration associated with arithmetic deficiencies.
Topic Area: NEUROANATOMY