size_weight_illusion

A dataset containing data from 28 healthy controls and one patient, DF, with
visual form agnosia (inability to perceive the form of objects) from
bilateral lesions to the lateral occipital complex. The size-weight illusion
occurs when a person underestimates the weight of a larger item when compared
to a smaller of equal weight (Charpentier, 1891). From these data, one can
assess the magnitude of the illusion for patient DF by comparison to
age-matched controls under visual and kinaesthetic cue conditions. The
measure of the size-weight illusion is a scaled measure expressing the
number of grams weight difference perceived per cubic cm of volume change
(Hassan et al, 2020).

datasets

When comparing single cases to control populations and no parameters are known researchers and clinicians must estimate these with a control sample. This is often done when testing a case's abnormality on some variable or testing abnormality of the discrepancy between two variables. Appropriate frequentist and Bayesian methods for doing this are here implemented, including tests allowing for the inclusion of covariates. These have been developed first and foremost by John Crawford and Paul Garthwaite, e.g. in Crawford and Howell (1998) <doi:10.1076/clin.12.4.482.7241>, Crawford and Garthwaite (2005) <doi:10.1037/0894-4105.19.3.318>, Crawford and Garthwaite (2007) <doi:10.1080/02643290701290146> and Crawford, Garthwaite and Ryan (2011) <doi:10.1016/j.cortex.2011.02.017>. The package is also equipped with power calculators for each method.

Jonathan Rittmo

singcar

Comparing Single Cases to Small Samples

Robert McIntosh

size_weight_illusion function

A data frame with 29 rows and 6 variables:<dl>
 <dt>GROUP</dt>
<dd>factor with patient (SC) or control group (HC)</dd> <dt>PPT</dt>
<dd>participant identifier</dd> <dt>SEX</dt>
<dd>gender of partcipants</dd> <dt>YRS</dt>
<dd>age of participants</dd> <dt>V_SWI</dt>
<dd>SWI measure from the visual task</dd> <dt>K_SWI</dt>
<dd>SWI measure from the kinaesthetic task</dd>
</dl>

Format

Data from one patient and 28 controls on the size-weight illusion — size_weight_illusion

A data frame with 29 rows and 6 variables:<dl>
 <dt>GROUP</dt>
<dd>factor with patient (SC) or control group (HC)</dd>

 <dt>PPT</dt>
<dd>participant identifier</dd>

 <dt>SEX</dt>
<dd>gender of partcipants</dd>

 <dt>YRS</dt>
<dd>age of participants</dd>

 <dt>V_SWI</dt>
<dd>SWI measure from the visual task</dd>

 <dt>K_SWI</dt>
<dd>SWI measure from the kinaesthetic task</dd>


</dl>

size_weight_illusion: Data from one patient and 28 controls on the size-weight illusion

Description

Usage

Arguments

Format

References