Holcombe:Optacon

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

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