README

DATA COLLECTION
The data were collected between September 2017 and May 2018 in 
the Effort Lab (www.effortlab.website) facilities at Liverpool John Moores 
University (LJMU). In both studies, 40 participants performed an isometric hand 
grip task under varying task difficulty conditions. In addition to the force 
exerted during the hand grip task, participants' explicit need for achievement 
were collected with Jackson's Personality Research Inventory (PRF). For further 
details, please contact Michael Richter (m.richter@ljmu.ac.uk) or read the 
methods description in the associated paper.

METADATA
The RichterEtAl_2020a_Data.zip file includes all data and scripts used to collect 
the data of the two studies. The MoEffHG1 folder includes data and scripts of 
Study 1, the MoEffHG2 folder includes Study 2 data and scripts. In each 
MoEffHGx folder are two subfolders Data and ProgrammeFiles. The Data subfolders 
include a ForceData subfolder that includes one file per participant that 
includes all collected force data as well as a QuestData folder that includes a 
single file with the demographic and PRF data of all participants. The 
ProgrammeFiles folders include an Inquisit subfolder that includes the Inquisit 
script file used to collect dempgraphic and PRR data as well as a LabView 
folder that includes the LabView files used to run the study. The Inquisit 
script files provide all information required to understand the meaning of the 
column headers of the data files including demographic and PRF data. The force 
data files include two columns. The first column includes exerted force values 
(in Newton), the second column codes the trial type (1 = pre-task maximum force 
trials, 2 = post task maximum force trials, XXX = hand grip task trial with a 
force standard of XXX Newton). For further information, please contact Michael 
Richter (m.richter@ljmu.ac.uk).

STATISTICAL ANALYSIS All statistical analyses 
were conducted using R (version 3.5.3). Further information can be obtained 
from Michael Richter (m.richter@ljmu.ac.uk).