Distorted body representations are robust to differences in experimental instructions

Several recent reports have shown that even healthy adults maintain highly distorted representations of the size and shape of their body. These distortions have been shown to be highly consistent across different study designs and dependent measures. However, previous studies have found that visual judgments of size can be modulated by the experimental instructions used, for example, by asking for judgments of the participant’s subjective experience of stimulus size (i.e., apparent instructions) versus judgments of actual stimulus properties (i.e., objective instructions). Previous studies investigating internal body representations have relied exclusively on ‘apparent’ instructions. Here, we investigated whether apparent versus objective instructions modulate findings of distorted body representations underlying position sense (Exp. 1), tactile distance perception (Exp. 2), as well as the conscious body image (Exp. 3). Our results replicate the characteristic distortions previously reported for each of these tasks and further show that these distortions are not affected by instruction type (i.e., apparent vs. objective). These results show that the distortions measured with these paradigms are robust to differences in instructions and do not reflect a dissociation between perception and belief

Part-based representations of the body in early childhood: evidence from perceived distortions of tactile space across limb boundaries

Studies show that touch in adults is referenced to a representation of the body that is structured topologically according to body parts; the perceived distance between two stimuli crossing over a body part boundary is elongated relative to the perceived distance between two stimuli presented within one body part category. Here we investigate this influence of body parts on tactile space perception in children of 5, 6 and 7 years of age. We presented children with pairs of tactile stimuli on the left hand/arm, either within the hand, within the forearm, or over the wrist. With their eyes closed children were asked to adjust the distance between the thumb and forefinger of their right hand to represent the felt distance between the two tactile stimuli. Like adults, the children perceived the distance between two stimuli that cross the body part boundary to be further apart than those that were presented within the hand or arm. They also perceive tactile distance to be greater on the hand than the arm which is the first observation of Weber's illusion in young children. We propose that a topological mode of body representation is particularly advantageous during early life given that body part categories remain constant while the metric proportions of the body change substantially as the child grows

The categorical perception of tactile distance: a difference in acuity at anatomical landmarks?

Tactile distance judgments are prone to a number of physiological and perceptual distortions. One such distortion concerns tactile distances over the wrist being perceptually elongated relative to those within the hand or arm. This has been interpreted as a categorical segmentation effect: The wrist implicitly serves as a partition between two body part categories so that stimuli crossing the wrist appear further apart. The effect could alternatively be explained in terms of specialized acuity at anatomical landmarks (i.e., the wrist). To test these opposing explanations we presented participants with two tactile distances sequentially for comparison (one mediolaterally, across the arm, and the other proximodistally, along the arm). Points-of-Subjective-Equality (DV) were compared on the hand, wrist and arm, on dorsal and ventral surfaces between subjects. If the acuity account were true distances would be elongated in both axes at the wrist. If the categorical segmentation account were true there would be a selective perceived increase of the proximodistal distance at the wrist. A previously reported mediolateral bias was found on all body parts but, consistent with the categorical account, at the wrist the magnitude of the bias was either reduced (dorsally) or not found (ventrally) suggesting a selective proximodistal elongation. We found no evidence of increased acuity in the vicinity of the wrist in this task. Therefore we conclude that the segmentation of the body into discrete parts induces categorical perception of tactile distance

Don't sweat the small stuff: Understanding teacher resilience at the chalkface

This study investigates how graduating and early career teachers perceive resilient teachers. Informed by survey data from 200 graduating and early career teachers, the study's results indicate that graduating and early career teachers perceive that resilience for teachers comprises characteristics that are multi-dimensional and overlapping, and that views of resilience may develop according to teachers' career stage. To further conceptualise teacher resilience, four possible dimensions of teacher resilience (profession-related, emotional, motivational and social) are suggested and the aspects within these dimensions are described. Some implications of this view of teacher resilience for preservice teacher education and future research are discussed