TY  - JOUR
A1  - Muth, Felicitas V.
A1  - Heilig, Michael
A1  - Marquardt, Dorothea
A1  - Mittelberg, Linda
A1  - Sebald, Albrecht
A1  - Kunde, Wilfried
T1  - Lightness perception of structured surfaces
JF  - Color Research and Application
N2  - Visual perception of surfaces is of utmost importance in everyday life. Therefore, it comes naturally, that different surface structures evoke different visual impressions in the viewer even if the material underlying these surface structures is the same. This topic is especially virulent for manufacturing processes in which more than one stakeholder is involved, but where the final product needs to meet certain criteria. A common practice to address such slight but perceivable differences in the visual appearance of structured surfaces is that trained evaluators assess the samples and assign a pass or fail. However, this process is both time consuming and cost intensive. Thus, we conducted two studies to analyze the relationship between physical surface structure parameters and participants visual assessment of the samples. With the first experiment, we aimed at uncovering a relationship between physical roughness parameters and visual lightness perception while the second experiment was designed to test participants' discrimination sensitivity across the range of stimuli. Perceived lightness and the measured surface roughness were nonlinearly related to the surface structure. Additionally, we found a linear relationship between the engraving parameter and physical brightness. Surface structure was an ideal predictor for perceived lightness and participants discriminated equally well across the entire range of surface structures.
KW  - surface structure
KW  - appearance
KW  - color perception
KW  - maximum likelihood difference scaling
KW  - psychophysics
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-257314
VL  - 47
IS  - 2
ER  - 
TY  - JOUR
A1  - Muth, Felicitas V.
A1  - Wirth, Robert
A1  - Kunde, Winfried
T1  - Temporal binding past the Libet clock: testing design factors for an auditory timer
JF  - Behavior Research Methods
N2  - Voluntary actions and causally linked sensory stimuli are perceived to be shifted towards each other in time. This so-called temporal binding is commonly assessed in paradigms using the Libet Clock. In such experiments, participants have to estimate the timing of actions performed or ensuing sensory stimuli (usually tones) by means of a rotating clock hand presented on a screen. The aforementioned task setup is however ill-suited for many conceivable setups, especially when they involve visual effects. To address this shortcoming, the line of research presented here establishes an alternative measure for temporal binding by using a sequence of timed sounds. This method uses an auditory timer, a sequence of letters presented during task execution, which serve as anchors for temporal judgments. In four experiments, we manipulated four design factors of this auditory timer, namely interval length, interval filling, sequence predictability, and sequence length, to determine the most effective and economic method for measuring temporal binding with an auditory timer.
KW  - temporal binding
KW  - auditory timer
KW  - experimental design
KW  - measures
KW  - intentional binding
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-234922
VL  - 53
IS  - 3
ER  -