Poor shape perception is the reason reaches-to-grasp are visually guided online

Lee, Young Lim; Crabtree, Charles E.; Norman, J. Farley; Bingham, Geoffrey P.

doi:10.3758/pp.70.6.1032

Cited by 31 publications

(28 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The affine structure is in principle ambiguous, since it only determines the shape of an object up to an arbitrary linear stretch along the line of sight. It therefore encodes important ordinal properties, like the depth order of feature points, the parallelism of lines, and the relative length of parallel segments (Lee et al 2008;Todd et al 1995). If only affine information is accurately carried on from the earliest stages of 3D processing, then it is possible to predict systematic biases and great variability in perceptual and motor tasks that require Euclidean estimates .…”

Section: Discussionmentioning

confidence: 99%

Lack of depth constancy for grasping movements in both virtual and real environments

Bozzacchi

Domini

2015

Journal of Neurophysiology

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Lack of depth constancy for grasping movements in both virtual and real environments

Bozzacchi

Domini

2015

Journal of Neurophysiology

View full text Add to dashboard Cite

show abstract

“…Both were increased by 25%. What would happen if they were changed in different ways, for instance, one increased and the other decreased, or Bingham and Pagano (1998), Bingham and Romack (1999), Coats, Bingham and MonWilliams (2008), Hu, Eagleson and Goodale (1999), Lee, Crabtree, Norman and Bingham (2008), Mon-Williams and Bingham (2007), Vindras and Viviani (1998). Calibration is akin to learning and as such, it naturally involves dynamics.…”

Section: Discussionmentioning

confidence: 99%

Calibration is action specific but perturbation of perceptual units is not.

Pan

Coats

Bingham

2014

Journal of Experimental Psychology: Human Perception and Perfor

View full text Add to dashboard Cite

Bingham and Pagano (1998) argued that metric space perception should be investigated using relevant action measures because calibration is an intrinsic component of perception/action that yields accurate targeted actions. They described calibration as a mapping from embodied units of perception to embodied units of action. This mapping theory yields a number of predictions. We tested two of them. The first prediction is that calibration should be action specific because what is calibrated is a mapping from perceptual units to a unit of action. Thus, calibration does not generalize to other actions.This prediction is consistent with the 'action specificity approach' to calibration (Proffitt, 2008). The second prediction is that a change in perceptual units should generalize to all relevant actions that are guided using that perceptual information. The same perceptual units can be mapped to different actions.Change in the unit affects all relevant actions. This prediction is consistent with the 'general purpose perception approach' (Loomis & Philbeck, 2008). In Experiment 1, two targeted actions, throwing and extended reaching were tested to determine if they were comparable in precision and in response to distorted calibration. They were. Comparing these actions, the first prediction was tested in Experiment 2 and confirmed. The second prediction was tested in Experiment 3 and confirmed. The 'action specificity' and 'general purpose perception' approaches each fail to predict the alternative results predicted by the other. Both sets of results were predicted by the 'mapping among embodied units' theory of calibration.

show abstract

“…Distance and size perception needed to be calibrated, but once they were, performance was good (see also Bingham, 2005;Bingham, Coats, & Mon-Williams, 2007;Coats, Bingham, & Mon-Williams, in press;Mon-Williams, Coats, & Bingham, 2004). However, feedback failed to improve performance in respect to object shape (Bingham, 2005;Lee, Crabtree, Norman, & Bingham, 2008), and position perception was found to be independent of shape perception ; see also Crowell, Todd, & Bingham, 2000Loomis, Philbeck, & Zahorik, 2002).…”

Section: Methodsmentioning

confidence: 99%

Large continuous perspective transformations are necessary and sufficient for accurate perception of metric shape

Bingham

Lind

2008

Perception & Psychophysics

Self Cite

View full text Add to dashboard Cite

524Object shape entails both qualitative and quantitative properties. On the one hand, shape entails relief structure or relative variations in the surface conformation (e.g., ellipsoidal vs. cylindrical). As has been described by Perotti, Todd, Lappin, and Phillips (1998), this characteristic of shape can be measured locally for smoothly curved surfaces by the shape characteristic, a ratio of the principal curvatures. On the other hand, metric shape can be measured by curvedness (Koenderink, 1990) or, alternatively, the ratio of an object's width to its depth. As has been reviewed by Todd, Tittle, and Norman (1995) and shown by Perotti et al. (1998), among many others (e.g., Brenner & van Damme, 1999;Lappin & Ahlström, 1994;Scarfe & Hibbard, 2006;Tittle, Todd, Perotti, & Norman, 1995;Todd & Norman, 1991), observers do not appear to be able to perceive metric shape, or the relative depth of objects, very accurately. Perotti et al. (1998), in particular, found that observers were well able to judge the shape characteristic but that judgments of curvedness were biased and highly variable. These studies involved structure from motion or stereo computer graphic displays of objects. Lind, Bingham, and Forsell (2003) asked observers to judge the shape of textured wooden cylinders-that is, actual objects that were about 7 cm in size. Aspect ratios (depth/width [D/W ]) between 0.46 and 1.81 were tested. Observers used binocular vision with free head movement in normal lighting, and the objects sat on a tabletop within reach distance, so that the tops of the objects could be seen. The participants adjusted the shape of an elliptical outline on a computer screen to match the perceived cross-sectional shape of each object. The results were much like those in Perotti et al. (1998). Judgments were highly variable and inaccurate. Lind et al. (2003) replicated the result with variations in viewing height and distance. The participants did not reliably begin to get it right until they were essentially looking straight down at the tops of the objects, so they could match their outline to the top edge of the cylinders appearing in a frontoparallel plane. It is clear that observers cannot judge metric shape under viewing conditions that allow only relatively small perspective variations ( 10º).There We investigated the ability to perceive the metric shape of elliptical cylinders. A large number of previous studies have shown that small perspective variations ( 10º) afforded by stereovision and by head movements fail to allow accurate perception of metric shape. If space perception is affine (Koenderink & van Doorn, 1991), observers are unable to compare or relate lengths in depth to frontoparallel lengths (i.e., widths). Frontoparallel lengths can be perceived correctly, whereas lengths in depth generally are not. We measured reaches to evaluate shape perception and investigated whether larger perspective variations would allow accurate perception of shape. In Experiment 1, we replicated previous results showing poor perception wi...

show abstract

Poor shape perception is the reason reaches-to-grasp are visually guided online

Cited by 31 publications

References 30 publications

Lack of depth constancy for grasping movements in both virtual and real environments

Lack of depth constancy for grasping movements in both virtual and real environments

Calibration is action specific but perturbation of perceptual units is not.

Large continuous perspective transformations are necessary and sufficient for accurate perception of metric shape

Contact Info

Product

Resources

About