Auditory Translational Motion

• 1. Requirements
• 2. Installation
• 3. Structure and function details _ 3.1. audioLocTranslational _ 3.2. setParameters _ 3.3. subfun/expDesign _ 3.3.1. EVENTS _ 3.3.2. TARGETS: _ 3.3.3. Input: _ 3.3.4. Output: _ 3.4. subfun/eyeTracker * 3.5. subfun/wait4Trigger

1. Requirements

Make sure that the following toolboxes are installed and added to the matlab / octave path.

For instructions see the following links:

Requirements	Used version
PsychToolBox	>=3.0.14
Matlab	>=2017b
or octave	>=4.?

2. Installation

The CPP_BIDS and CPP_PTB dependencies are already set up as submodule to this repository. You can install it all with git by doing.

git clone --recurse-submodules https://github.com/cpp-lln-lab/localizer_auditory_motion.git

3. Structure and function details

3.1. audioLocTranslational

Running this script will play blocks of motion/static sounds. Motion blocks will play sounds moving in one of four directions (up-, down-, left-, and right-ward)

By default it is run in Debug mode meaning that it does not care about subjID, run n., fMRI triggers, Eye Tracker, etc..

Any details of the experiment can be changed in setParameters.m (e.g., experiment mode, motion stimuli details, exp. design, etc.)

3.2. setParameters

setParameters.m is the core engine of the experiment. It contains the following tweakable sections:

• Debug mode setting
• Engine parameters:
  • Devices parameters
  • Monitor parameters
  • Keyboard parameters
  • MRI parameters
• Experiment Design
• Timing
• Auditory Stimulation
• Task(s)
  • Instructions
  • Task #1 parameters

3.3. subfun/expDesign

Creates the sequence of blocks and the events in them. The conditions are consecutive static and motion blocks (Gives better results than randomised). It can be run as a stand alone without inputs to display a visual example of a possible design.

3.3.1. EVENTS

The numEventsPerBlock should be a multiple of the number of "base" listed in the motionDirections and staticDirections (4 at the moment).

3.3.2. TARGETS:

• If there are 2 targets per block we make sure that they are at least 2 events apart.
• Targets cannot be on the first or last event of a block

3.3.3. Input:

• expParameters: parameters returned by setParameters
• displayFigs: a boolean to decide whether to show the basic design matrix of the design

3.3.4. Output:

• expParameters.designBlockNames is a cell array (nr_blocks, 1) with the name for each block
• expParameters.designDirections is an array (nr_blocks, numEventsPerBlock) with the direction to present in a given block
  • 0 90 180 270 indicate the angle
  • -1 indicates static
• expParameters.designSpeeds is an array (nr_blocks, numEventsPerBlock) * speedEvent
• expParameters.designFixationTargets is an array (nr_blocks, numEventsPerBlock) showing for each event if it should be accompanied by a target

3.4. subfun/eyeTracker

Eyetracker script, still to be debugged. Will probably moved in the CPP_PTB package. It deals with the calibration (dufault or custom), eye movements recording and saving the files.

3.5. subfun/wait4Trigger

Simple functions that counts the triggers sent by the MRI computer to the stimulation computer to sync brain volume recordings and stimulation.