Page History: Experiment
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Page Revision: 2013/10/05 08:05
Description
Experiment is a root object in the EventIDE logic that accommodates an experiment scenario, stimulus materials and user code. The experiment object has a set of editable
properties that represent global settings, such as a screen resolution or a default background color. The experiment object and accommodated content are saved together in a single file recognizable by ".eve" extension.
Creating a new experiment
Creating a new experiment in EventIDE resembles creating a new document in other programs. Open the application menu and press 'New' item. Then you can chose whether you want to create a blank experiment or pick up one of templates in the Template gallery. A black experiment will contain one layer with a single event. Then you should build a scenario, load stimulus materials, write a code and, finally, run your task with participants. When you open one of experiment templates, you should only customize its content for your needs.
Editing the experiment properties
EventIDE GUI has a dedicated ribbon tab that shows a summary of the current experiment. The tab is call
HQ Panel. When you open it, you can access and edit the experiment properties in the property grid.
Snapshots
 Snapshot 1
| Snapshot 2 |
Experiment Properties
| Name | Description | Attributes | Value Type |
|---|
| Control |
| Stop Key | Defines the keyboard button which press aborts the experiment at runtime. By default, it is Escape button. | D | List |
| Background | Defines the base background color of all visual scenes in the experiment. For example, if the transparent background is used in events, the base background color will be used for the back of the screen. | D | clColor |
| Perfomance |
| Ahead Lock | Defines duration of a locking time interval, in ms, just before switching between two events. During this time all activities, like snippet executions, are blocked to provide highest timing accuracy. The default reasonable value of this property, 10ms, is equal to the duration of one vertical frame on a monitor with refresh rate of 100hz. | D | UInt64 |
| Vertical Synch | Defines if activation of events with a visual content is synchronized with a start of the monitor vertical refresh. If the value is true, the visual output will be smoother and flicker free but event durations may be longer (never shorter) than the requested. The property value does not affect timing of non-visual events. | D | Boolean |
| Realtime Priority | Defines if the EventIDE process requests the highest, realtime priority for better timing accuracy while running the experiment. The recommended value is true for the multi-core computers and false for the single-core computers. | D | Boolean |
| Status Screen Priority | Defines a running priority of the Status Screen at runtime. Higher priority makes status screen's updates more frequent but may reduce timing accuracy in the experiment. | D | List |
| Resources Preload | Defines whether the certain library resources, like images, will be pre-loaded into computer memory on each experiment run. If true, the runtime visual rendering can speeds up by the cost of higher memory consumption. | D | Boolean |
| Non-exclusive Input | Defines whether input devices (e.g. keyboard or mouse) work in the non-exclusive mode and can be shared with other programs. If the value is false, the faster exclusive mode is used. | D | Boolean |
| Display Settings |
| Current Settings | Shows the requested display settings: the screen resolution, monitor distance and width, color depth and refresh rate for an experiment run. Notice that the refresh rate is used only for full-screen mode can be automatically adjusted if the requested value is not supported by hardware. | D, Read-only | string |
| Modify Settings | Brings a dialog window where all display settings can be changed. | Design-time action |
| Deep Color | Defines if the experiment is run in the Deep Color graphics mode that allows 10bits per color channel coding (as opposed to the 8-bit standard). The Deep Color mode is slower and it has to be supported by a graphic card. The mode can be utilized only by designated elements that can produce the deep color graphics. Other visual content in experiment is not affected by enabled Deep Color mode except rendering with alpha (transparency) channel which can be disrupted. Use this mode only in experiments with deep color visual scenes. | D | Boolean |
| Runtime |
| Child Index | Index of the active child event on its event layer. Setting this property at the runtime will cause immediate activation of the children event with the corresponded index regardless of the predefined event flow. | R* | Int32 |
| Radar | The most recent point in screen coordinates that is collected from the positional input provided by mouse. The property value is updated on every OnRunning cycle. Writing to this property at runtime will causes moving a mouse cursor to the provided position. | R | clPoint |
| Radar OK | Indicates if the coordinates exposed by the Radar property are inside of the current screen. | R | Boolean |
| Abort | Setting this property to true in snippets causes a stop of the current experiment run- the same as after pressing of the stop button. | R, Runtime action | Boolean |
| Report | Provides an access to the integrated data collection mechanism. Writing to this properly at runtime automatically causes adding of the written string into a new line of a data file (only one writing per single snippet execution is allowed). The resulting data file can be saved or exported after each experiment run. | R | String |
| Snapshot Image | Image that contains the most recent snapshot of the main experiment screen. Can be used on the status screen or be saved into a file. | R, Read-only | ImageSource |
| Visual Editor |
| Grid Step | Defines a grid step in the visual editor for events. | D | clSize |
| Statistics |
| Actual Duration | Actual duration of the experiment measured after its run. | D, Read-Only | UInt64 |
| Snippets Times | Execution times of experiment snippets in ms. Use the values to determine how fast the snippets are. | R, Read-Only | UInt64[] |
| Elapsed Time | The time passed since starts of the experiment run in ms. You can use this property as a global time counter in snippets. | R, Read-Only | UInt64 |
| Preparation Time | The time that the experiment needs for offline preparation of all visual scenes in events. | R, Read-Only | UInt64 |
| Drawing Time | The time that the experiment needs to send its background visual scene to the video memory. | R, Read-Only | UInt64 |
| Running Interval | The measured time interval between two last OnRunning cycles. If there is no work that the experiment does while running, this time interval is close to zero. | R, Read-Only | UInt64 |