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									 TIMED LIKERT SCALE DEMO
SCRIPT INFO

Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 02-20-2013
last updated: 02-03-2016 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Copyright © 02-03-2016 Millisecond Software


BACKGROUND INFO

											*Purpose*
This script implements a demonstration of a Timed Likert scale as used by:

Ferrando, P.J. & Lorenzo-Seva, U. (2007). A Measurement Model for Likert Responses That Incorporates Response Time.
MULTIVARIATE BEHAVIORAL RESEARCH, 42, 675–706.

The likert scale implemented in this script has 5 anchors like the one used by Ferrando & Lorenzo-Seva (2007).
According to the article "A five-point response is the upper limit recommended by Fazio (1990) when the 
information provided by the latencies is taken into account. (p.677/678)"

NOTE:
The build-in Inquisit likert scale used in this script does NOT let participants change their original response. 


											  *Task*
Participants are asked to select a response button on a five-point- Likert Scale in response to a given statement.

The reciprocals of the reaction times (converted from ms to s, and corrected for large and small reaction times 
are calculated for each question (see Ferrando & Lorenzo-Seva, 2007)


DATA FILE INFORMATION: 
The default data stored in the data files are:

(1) Raw data file: 'TimedLikert_raw*.iqdat' (a separate file for each participant)

build:							Inquisit build
computer.platform:				the platform the script was run on
date, time, subject, group:		date and time script was run with the current subject/groupnumber 
blockcode, blocknum:			the name and number of the current block
trialcode, trialnum: 			the name and number of the currently recorded trial
									(Note: not all trials that are run might record data; by default data is collected unless /recorddata = false is set for a particular trial/block) 
stimulusitem:					the presented stimuli in order of trial presentation
response:						the participant's response
latency: 						the response latency (in ms)
/rt:							contains the latency of the current response in ms
/corrected_rt_s:				corrected rt for large (>40) and small (< 0.5) reaction times (measured in seconds NOT ms)
								as suggested by Ferrando & Lorenzo-Seva (2007), p.689
/reciprocal_rt_s:				the inverse of the reaction times (measured in seconds NOT ms)

(2) Summary data file: 'TimedLikert_summary*.iqdat' (a separate file for each participant)

script.startdate:				date script was run
script.starttime:				time script was started
script.subjectid:				subject id number
script.groupid:					group id number
script.elapsedtime:				time it took to run script (in ms)
computer.platform:				the platform the script was run on
/completed:						0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run)


CUSTOMIZE ITEMS:
* Go to section EDITABLE STIMULI -> item.questions to edit/add items of interest
* Go to ssection BLOCKS -> block.timedlikert to edit the number of times the likert trial needs to be called

EDITABLE CODE:
check below for (relatively) easily editable parameters, stimuli, instructions etc. 
Keep in mind that you can use this script as a template and therefore always "mess" with the entire code to further customize your experiment.

The parameters you can change are:

/questionfontsize:				sets the fontsize of the question in canvas percentages (default: 5%)

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