Return to the Vividness of Visual Imagery Questionnaire page
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						Vividness of Visual Imagery Questionnaire (VVIQ)
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Script Author: Adnan Niazi (Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen) 
last updated:  11-06-2019 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Millisecond Software thanks Dr.Niazi for sharing his script!

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BACKGROUND INFO 	
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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:
http://web.archive.org/web/20080615154210/http://www.staff.city.ac.uk/d.marks/vviq.htm

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OVERVIEW
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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)

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DURATION 
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the default set-up of the script takes appr. 7 minutes to complete

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DATA FILE INFORMATION 
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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:						date and time script was run with the current group/subjectnumber 
subject, group, session:	   	 with the current subject/groupnumber/session id
build:							the Inquisit build 

q*_response:					response given (in assigned values)
									Scale: 1 (perfectly clear and vivid) - 5 (no image at all)									
									
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)

computer.platform:				the platform the script was run on (win/mac/ios/android)
script.startdate:					date script was run
script.starttime:					time script was started
script.subjectid:					assigned subject id number
script.groupid:					assigned group id number
script.sessionid:					assigned session id number
script.elapsedtime:				time it took to run script (in ms); measured from onset to offset of script
script.completed:				0 = script was not completed (prematurely aborted); 
									1 = script was completed (all conditions run)
demographics:
textbox.age.response:			age response of participant
radiobuttons.gender.response:	gender response of participant
textbox.occupation.response:	occupation response of participant

+ VVIQ scores for the open and closed surveys as well as the VVIQ total/combined score
Note: the lower the score, the higher the ability to imagine

expressions.vviqopeneyes: Range 16-80
expressions.vviqclosedeyes: Range 16-80
expressions.vviq_total: Range 32-160
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QUESTIONNAIRE SET-UP
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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

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INSTRUCTIONS 
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The htm instruction pages are provided by Millisecond Software (build on the instructions by A. Niazi). 
They were written to closely resemble the original 
(at: http://web.archive.org/web/20080615154210/http://www.staff.city.ac.uk/d.marks/vviq.htm)
while adapting them to the computerized set-up used in this script.

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EDITABLE CODE 
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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: