Difference between revisions of "Holcombe:Optacon"

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Instructions for using the Optacon setup (draft)
'''Overview of set-up'''
Tower+Monitor uses “Optacon Stimulator” software to provide input to Optacon Interface (the rectangular box with the TRS connectors/jacks).
The Optacon Interface uses input from Opticon Stimulator to drive the optacon
Powerlab box reads from Optacon Interface
Response buttons are connected to the Powerlab box
Laptop with Labchart collects the output from Powerlab box (button presses and signal from pins)
Switching on the system
Turn on the computers
Turn on Powerlab box (switch at back next to grey cord)
Turn on Optacon Interface (switch on top of box where it says Power)
Optacon should be the last thing you switch on
Switching off the system
Optacon should be the first thing you switch off
Then switch off the Optacon Interface + Powerlab box
Then switch off computers
Input to Optacon interface
The tower+monitor provides input to the optacon interface
Open Optacon Stimulator
Create New or Open
Uses .txt files – can make these in excel etc.
Array (frames) is the input
Dwell time – how long it stays on that frame
Pins have fixed vibration rate
Single protraction/retraction is 4.35ms for ~230Hz vibration
Dwell time specifies how long the pins vibrate in the arrangement of that frame
Note: Should take into account 4.35ms “frame duration”
e.g. if you put 5ms, It will do 2 protractions/frames, actually taking 8.7ms
OR Click on cells to manually change them
In array/frames for input: specify number of Blocks and Stimuli
Blocks are like the Folder
Stimuli are within blocks
Can repeat blocks or stimuli independently
In the input window for the pins
ANIMATE – can visualize how the pins are moving
Switch off animate when running experiment
Can cause lag if it is switched on
LOOP – will repeat whole sequence including blocks, stimuli – toggle on/off
First 5 seconds of task should be empty –
Might be vibrations due to noise etc, so have first 5 seconds empty to ensure experiment starts off clean
Powerlab box
Can choose which pins the Powerlab box records from
Data Collection
Laptop has Labchart on it
Uses this for data collection
Starting Labchart:
Labchart shortcut is on the desktop
When labchart loads it will seach for optacon interface
If optacon interface is powered off you can still load labchart
e.g. if you want to look at data
If you want to use it with the optacon interface make sure interface is on first
To use settings that have been made for use with optacon:
Open a template (e.g ‘example’)
Then: File – new – will ask if want to use settings based on other worksheet – click ‘yes’
Testing if everything is connected properly
Make a file that shows the button presses and the pins you are interested in recording from
Run and check if button presses and pin recordings correspond to the correct channel
e.g. Pin input test – test everything is plugged in properly
Press START button in the bottom right hand corner to start recording
Top 3 channels shows input – i.e. response from pressing buttons
Bottom 3 channels records from pins
Can toggle MONITOR to the left of start button – it will monitor responses/input but doesn’t record
Make sure it is off when you want to collect data
Monitor Off / Recording– Not showing red X
Monitor On / Not Recording – Showing red X
Can also set up new channels to calculate things from the other channels
Save raw data as an .adicht file before doing anything
Can select data points – ‘save as’ data file
For stats:
File – export – labchart txt file
Samples at 10k a second – can downsample it for smaller file size –
this may reduce precision of optacon pins because they are very fast
(so find a suitable sampling rate for your purposes)
Notes for running participants
Instruct participants that they do not need to press hard on buttons
Feels like it isn’t registering but it is
Use scales to measure pressure on fingers
Keep this constant over conditions and participants
If pressure is too high – will dampen the vibrations – should be gently touching
Misc notes:
Pull out blue cord at back of optacon to use the visual input part of the optacon
Switch at back – INVERT – black on white or white on black
Make sure optacon is not resting on the array – can damage the pins
ALWAYS BE CAREFUL – it is a fragile piece of equipment we can’t easily replacea
--[[User:Elizabeth Nguyen|Elizabeth Nguyen]] 01:47, 13 July 2012 (EDT)
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Revision as of 22:49, 12 July 2012