Gunnar Schmidtmann
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View article: Investigating Age-Related Decline in Sensorimotor Control Using Robotic Tasks
Investigating Age-Related Decline in Sensorimotor Control Using Robotic Tasks Open
Aging is associated with changes in sensorimotor control that contribute to functional decline, mobility limitations, and increased fall risk. Traditional motor assessments often rely on subjective measures, highlighting the need for objec…
View article: Investigating the repeatability and behavioral relationships of acuity, contrast sensitivity, form, and motion perception measurements using a novel tablet-based vision test tool
Investigating the repeatability and behavioral relationships of acuity, contrast sensitivity, form, and motion perception measurements using a novel tablet-based vision test tool Open
Visual function tests are important in basic and clinical vision research but are typically limited to very few aspects of human vision, coarse diagnostic resolution, and require an administrator. Recently, the generalizable, response-adap…
View article: The influence of similarity, sensitivity and bias on letter identification
The influence of similarity, sensitivity and bias on letter identification Open
Previous studies have demonstrated that bias, sensitivity and similarity between letters are causes of errors in letter identification. However, these factors and their relative contribution in letter identification have not been investiga…
View article: The discrimination of self from other as a component of empathy.
The discrimination of self from other as a component of empathy. Open
Despite the centrality of empathy in human social life, there is no widely agreed definition or characterization of the concept of empathy. A common thread in many of the proposed definitions, however, is that empathy presupposes the discr…
View article: Clinician’s perspectives in using head impulse-nystagmus-test of skew (HINTS) for acute vestibular syndrome: UK experience
Clinician’s perspectives in using head impulse-nystagmus-test of skew (HINTS) for acute vestibular syndrome: UK experience Open
Background Acute vestibular syndrome (AVS) features continuous dizziness and may result from a benign inner ear disorder or stroke. The head impulse-nystagmus-test of skew (HINTS) bedside assessment is more sensitive than brain MRI in iden…
View article: The effect of response biases on resolution thresholds of Sloan letters in central and paracentral vision
The effect of response biases on resolution thresholds of Sloan letters in central and paracentral vision Open
Purpose Letter resolution depends on three factors: perceivability, response bias, and similarity. The aim of the present study was to investigate the effect of response bias (the sensory-independent factor) on resolution thresholds of Slo…
View article: In the Blink of an Eye: Reading Mental States From Briefly Presented Eye Regions
In the Blink of an Eye: Reading Mental States From Briefly Presented Eye Regions Open
Faces provide not only cues to an individual’s identity, age, gender, and ethnicity but also insight into their mental states. The aim was to investigate the temporal aspects of processing of facial expressions of complex mental states for…
View article: PEC901671 Supplementary Material2 - Supplemental material for The McGill Face Database: Validation and Insights Into the Recognition of Facial Expressions of Complex Mental States
PEC901671 Supplementary Material2 - Supplemental material for The McGill Face Database: Validation and Insights Into the Recognition of Facial Expressions of Complex Mental States Open
Supplemental material, PEC901671 Supplementary Material2 for The McGill Face Database: Validation and Insights Into the Recognition of Facial Expressions of Complex Mental States by Gunnar Schmidtmann, Ben J. Jennings, Dasha A. Sandra, Jor…
View article: Temporal processing of facial expressions of mental states
Temporal processing of facial expressions of mental states Open
Faces provide not only cues to an individual’s identity, age, gender and ethnicity, but also insight into their mental states. The ability to identify the mental states of others is known as Theory of Mind. Here we present results from a s…
View article: The McGill Face Database: validation and insights into the recognition of facial expressions of complex mental states
The McGill Face Database: validation and insights into the recognition of facial expressions of complex mental states Open
Current databases of facial expressions of mental states typically represent only a small subset of expressions, usually covering the basic emotions (fear, disgust, surprise, happiness, sadness, and anger). To overcome these limitations, w…
View article: RF shape channels: The processing of compound Radial Frequency patterns.
RF shape channels: The processing of compound Radial Frequency patterns. Open
Radial Frequency (RF) patterns are quasi-circular contours that are frequently used to investigate intermediate stages of shape processing. Combinations of RF patterns have been used to construct more complex shapes such as head contours. …
View article: Sensitivity to Binocular Disparity is Reduced by Mild Traumatic Brain Injury
Sensitivity to Binocular Disparity is Reduced by Mild Traumatic Brain Injury Open
Our results suggest that the reduced disparity sensitivity in patients with mTBI is more likely caused by cortical changes (e.g., axonal shearing, or reduced interhemispheric communication) rather than oculomotor dysfunction.
View article: Nothing more than a curve: a common mechanism for the detection of radial and non-radial frequency patterns?
Nothing more than a curve: a common mechanism for the detection of radial and non-radial frequency patterns? Open
Radial frequency (RF) patterns, which are sinusoidal modulations of a radius in polar coordinates, have been frequently used to study shape perception. Discriminating RF patterns from circles could be accomplished either by mechanisms sens…
View article: Probability, not linear summation, mediates the detection of concentric orientation-defined textures
Probability, not linear summation, mediates the detection of concentric orientation-defined textures Open
Previous studies investigating signal integration in circular Glass patterns have concluded that the information in these patterns is linearly summed across the entire display for detection. Here we test whether an alternative form of summ…
View article: Modelling probability summation for the detection of multiple stimuli under the assumptions of signal detection theory
Modelling probability summation for the detection of multiple stimuli under the assumptions of signal detection theory Open
In general there are two ways in which multiple stimuli can sum to threshold: by probability summation or by additive summation (of which linear summation is a special case). Probability summation (PS) is still often modelled using the lon…
View article: Shape recognition: convexities, concavities and things in between
Shape recognition: convexities, concavities and things in between Open
Previous studies on shape recognition have drawn different conclusions regarding the importance of specific object features, such as convexities, concavities and intermediate points. Some studies found evidence for a predominant role of co…
View article: Rejecting probability summation for RF patterns, not so Quick!
Rejecting probability summation for RF patterns, not so Quick! Open
Investigations of shape processing frequently use radial frequency (RF) patterns. An RF pattern is a circular contour with a periodic modulation applied to its radius. The way in which the visual system detects these patterns has been stud…
View article: Distinct lower visual field preference for object shape
Distinct lower visual field preference for object shape Open
Humans manipulate objects chiefly within their lower visual field, a consequence of upright posture and the anatomical position of hands and arms.This study tested the hypothesis of enhanced sensitivity to a range of stimuli within the low…
View article: Modeling probability and additive summation for detection across multiple mechanisms under the assumptions of signal detection theory
Modeling probability and additive summation for detection across multiple mechanisms under the assumptions of signal detection theory Open
Many studies have investigated how multiple stimuli combine to reach threshold. There are broadly speaking two ways this can occur: additive summation (AS) where inputs from the different stimuli add together in a single mechanism, or prob…