TY  - JOUR
A1  - Gruss, L. Forest
A1  - Wieser, Matthias J.
A1  - Schweinberger, Stefan R.
A1  - Keil, Andreas
T1  - Face-evoked steady-state visual potentials: effects of presentation rate and face inversion
JF  - Frontiers in Human Neuroscience
N2  - Face processing can be explored using electrophysiological methods. Research with event-related potentials has demonstrated the so-called face inversion effect, in which the N170 component is enhanced in amplitude and latency to inverted, compared to upright, faces. The present study explored the extent to which repetitive lower-level visual cortical engagement, reflected in flicker steady-state visual evoked potentials (ssVEPs), shows similar amplitude enhancement to face inversion. We also asked if inversion-related ssVEP modulation would be dependent on the stimulation rate at which upright and inverted faces were flickered. To this end, multiple tagging frequencies were used (5, 10, 15, and 20 Hz) across two studies (n=21, n=18). Results showed that amplitude enhancement of the ssVEP for inverted faces was found solely at higher stimulation frequencies (15 and 20 Hz). By contrast, lower frequency ssVEPs did not show this inversion effect. These findings suggest that stimulation frequency affects the sensitivity of ssVEPs to face inversion.
KW  - N170
KW  - upside-down faces
KW  - selective attention
KW  - spatial attention
KW  - cortex
KW  - perception
KW  - recognition
KW  - brain
KW  - FMRI
KW  - area
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-134399
VL  - 6
IS  - 316
ER  - 
TY  - JOUR
A1  - Huestegge, Lynn
A1  - Rohrßen, Julia
A1  - van Ermingen-Marbach, Muna
A1  - Pape-Neumann, Julia
A1  - Heim, Stefan
T1  - Devil in the details ? Developmental dyslexia and visual long-term memory for details
JF  - Frontiers in Psychology
N2  - Cognitive theories on causes of developmental dyslexia can be divided into language-specific and general accounts. While the former assume that words are special in that associated processing problems are rooted in language-related cognition (e.g., phonology) deficits, the latter propose that dyslexia is rather rooted in a general impairment of cognitive (e.g., visual and/or auditory) processing streams. In the present study, we examined to what extent dyslexia (typically characterized by poor orthographic representations) may be associated with a general deficit in visual long-term memory (LTM) for details. We compared object- and detail-related visual LTM performance (and phonological skills) between dyslexic primary school children and IQ-, age-, and gender-matched controls. The results revealed that while the overall amount of LTM errors was comparable between groups, dyslexic children exhibited a greater portion of detail-related errors. The results suggest that not only phonological, but also general visual resolution deficits in LTM may play an important role in developmental dyslexia.
KW  - anguage and word processing
KW  - picture processing
KW  - memory errors
KW  - orthographic representations
KW  - visual resolution deficit
KW  - phonology and reading
KW  - word form area
KW  - reading disability
KW  - spatial attention
KW  - ventral stream
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-115887
SN  - 1664-1078
VL  - 5
IS  - 686
ER  -