All Outputs (29)

The functional brain networks that underlie Early Stone Age tool manufacture (2017)
Journal Article
Putt, S. S., Wijeakumar, S., Franciscus, R. G., & Spencer, J. P. (2017). The functional brain networks that underlie Early Stone Age tool manufacture. Nature Human Behaviour, 1(6), Article 0102. https://doi.org/10.1038/s41562-017-0102

After 800,000 years of making simple Oldowan tools, early humans began manufacturing Acheulian handaxes around 1.75 million years ago. This advance is hypothesized to reflect an evolutionary change in hominin cognition and language abilities. We used... Read More about The functional brain networks that underlie Early Stone Age tool manufacture.

Model-based functional neuroimaging using dynamic neural fields: An integrative cognitive neuroscience approach (2016)
Journal Article
Wijeakumar, S., Ambrose, J. P., Spencer, J. P., & Curtu, R. (2017). Model-based functional neuroimaging using dynamic neural fields: An integrative cognitive neuroscience approach. Journal of Mathematical Psychology, 76(Part B), 212-235. https://doi.org/10.1016/j.jmp.2016.11.002

Validating an image-based fNIRS approach with fMRI and a working memory task (2016)
Journal Article
Wijeakumar, S., Huppert, T. J., Magnotta, V. A., Buss, A. T., & Spencer, J. P. (2017). Validating an image-based fNIRS approach with fMRI and a working memory task. NeuroImage, 147, 204-218. https://doi.org/10.1016/j.neuroimage.2016.12.007

© 2016 Elsevier Inc. In the current study, we extend a previous methodological pipeline by adding a novel image reconstruction approach to move functional near-infrared (fNIRS) signals from channel-space on the surface of the head to voxel-space with... Read More about Validating an image-based fNIRS approach with fMRI and a working memory task.

Feature-Based Change Detection Reveals Inconsistent Individual Differences in Visual Working Memory Capacity (2016)
Journal Article
Ambrose, J. P., Wijeakumar, S., Buss, A. T., & Spencer, J. P. (2016). Feature-Based Change Detection Reveals Inconsistent Individual Differences in Visual Working Memory Capacity. Frontiers in Systems Neuroscience, 10, Article 33. https://doi.org/10.3389/fnsys.2016.00033

Response control networks are selectively modulated by attention to rare events and memory load regardless of the need for inhibition (2015)
Journal Article
Wijeakumar, S., Magnotta, V. A., Buss, A. T., Ambrose, J. P., Wifall, T. A., Hazeltine, E., & Spencer, J. P. (2015). Response control networks are selectively modulated by attention to rare events and memory load regardless of the need for inhibition. NeuroImage, 120, 331-344. https://doi.org/10.1016/j.neuroimage.2015.07.026

© 2015 Elsevier Inc. Recent evidence has sparked debate about the neural bases of response selection and inhibition. In the current study, we employed two reactive inhibition tasks, the Go/Nogo (GnG) and Simon tasks, to examine questions central to t... Read More about Response control networks are selectively modulated by attention to rare events and memory load regardless of the need for inhibition.

Validating a new methodology for optical probe design and image registration in fNIRS studies (2014)
Journal Article
Wijeakumar, S., Spencer, J. P., Bohache, K., Boas, D. A., & Magnotta, V. A. (2015). Validating a new methodology for optical probe design and image registration in fNIRS studies. NeuroImage, 106, 86-100. https://doi.org/10.1016/j.neuroimage.2014.11.022

© 2014 Elsevier Inc. Functional near-infrared spectroscopy (fNIRS) is an imaging technique that relies on the principle of shining near-infrared light through tissue to detect changes in hemodynamic activation. An important methodological issue encou... Read More about Validating a new methodology for optical probe design and image registration in fNIRS studies.

Haemodynamic Responses to Radial Motion in the Visual Cortex (2013)
Journal Article
Wijeakumar, S., Shahani, U., Simpson, W. A., & McCulloch, D. L. (2013). Haemodynamic Responses to Radial Motion in the Visual Cortex. Journal of Near Infrared Spectroscopy, 21(4), 231-236. https://doi.org/10.1255/jnirs.1056

Functional near-infrared spectroscopy (fNIRS) is an optical imaging technique that relies on emitting near-infrared light into cortical tissue to measure changes in haemoglobin concentrations as a result of stimulation. The purpose of this study was... Read More about Haemodynamic Responses to Radial Motion in the Visual Cortex.

Neural and Vascular Responses to Fused Binocular Stimuli: A VEP and fNIRS Study (2012)
Journal Article
Wijeakumar, S., Shahani, U., McCulloch, D. L., & Simpson, W. A. (2012). Neural and Vascular Responses to Fused Binocular Stimuli: A VEP and fNIRS Study. Investigative Ophthalmology & Visual Science, 53(9), 5881-5889. https://doi.org/10.1167/iovs.12-10399

Purpose.: The aim of our study was to investigate the correlation between neural and hemodynamic responses to stereoscopic stimuli recorded over visual cortex.

Methods.: Test stimuli consisted of a static checkerboard (checks) and dichoptic stati... Read More about Neural and Vascular Responses to Fused Binocular Stimuli: A VEP and fNIRS Study.

Localization of Hemodynamic Responses to Simple Visual Stimulation: An fNIRS Study (2012)
Journal Article
Wijeakumar, S., Shahani, U., Simpson, W. A., & McCulloch, D. L. (2012). Localization of Hemodynamic Responses to Simple Visual Stimulation: An fNIRS Study. Investigative Ophthalmology & Visual Science, 53(4), 2266-2273. https://doi.org/10.1167/iovs.11-8680

Purpose.: The purpose of the study was to use functional near-infrared spectroscopy (fNIRS) to explore the extent of activation in occipito-parietal cortices to high-contrast checkerboard stimuli. The distributions of oxyhemoglobin (HbO), deoxyhemogl... Read More about Localization of Hemodynamic Responses to Simple Visual Stimulation: An fNIRS Study.