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						Vividness of Visual Imagery Questionnaire (VVIQ)

Script Author: Adnan Niazi (Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen) 
last updated:  04-19-2017 by K. Borchert ( for Millisecond Software, LLC

Millisecond Software thanks Dr.Niazi for sharing his script!


This script implements the VVIQ by

Marks, D.F. (1973). Visual imagery differences in the recall of pictures. 
British Journal of Psychology, 64(1), 17–24.

A paper version of this VVIQ is available on David Marks webpage:

participant rates once with eyes open/once with eyes closed the vividness of
16 imagined scenes on a 5-point scale (a glider is used in this script).
Each response receives 1 (highest vividness) to 5 (lowest vividness) points.

Max combined score = 5*32 = 160 (low vividness)
Min combined score = 1*32 = 32 (high vividness)

The default data stored in the data files are:

(1) Raw data files: 'VVIQ_openeyes*.iqdat'/'VVIQ_closedeyes*.iqdat' (a separate file for each participant)

date, time, group, subject:		date and time script was run with the current group/subjectnumber 
build:							the Inquisit build 

q*_response:					response given (in assigned values)
q*_latency:						how much time (in ms) the participant spent on the surveypage with this particular question (the last time this particular surveypage was visited)

(2) Summary data file: 'VVIQ_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)
textbox.age.response:				age response of participant
radiobuttons.gender.response:		gender response of participant
textbox.occupation:					occupation response of participant
+ VVIQ scores for the open and closed surveys as well as the VVIQ total/combined score

This script first presents the VVIQ with Eyes open and is then followed by the
VVIQ with Eyes closed. A separate score as well as a combined score is obtained for each part.
VVIQ_eyesopen.iqx => raw data for the VVIQ with eyes open instructions
VVIQ_eyesclosed.iqx => raw data for the VVIQ with eyes closed instructions
VVIQ_scores.iqx => scores for each survey as well as a total score

The htm instruction pages are provided by Millisecond Software (build on the instructions by A. Niazi). 
They were written to closely resemble the original 
while adapting them to the computerized set-up used in this script.

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.

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