# serial-reaction-time-mouse
Current version: 1.1.3. [See version history](https://github.com/jspsych/jsPsych/blob/main/packages/plugin-serial-reaction-time-mouse/CHANGELOG.md).
The serial reaction time mouse plugin implements a generalized version of the SRT task [(Nissen & Bullmer, 1987)](https://doi.org/10.1016%2F0010-0285%2887%2990002-8). Squares are displayed in a grid-based system on the screen, and one square changes color. The participant must click on the square that changes color.
## Parameters
In addition to the [parameters available in all plugins](../overview/plugins.md#parameters-available-in-all-plugins), this plugin accepts the following parameters. Parameters with a default value of *undefined* must be specified. Other parameters can be left unspecified if the default value is acceptable.
| Parameter | Type | Default Value | Description |
| ------------------------- | -------------- | ------------- | ---------------------------------------- |
| target | array | *undefined* | The location of the target. The array should be the `[row, column]` of the target. |
| grid | array | `[[1,1,1,1]]` | This array represents the grid of boxes shown on the screen. Each inner array represents a single row. The entries in the inner arrays represent the columns. If an entry is `1` then a square will be drawn at that location on the grid. If an entry is `0` then the corresponding location on the grid will be empty. Thus, by mixing `1`s and `0`s it is possible to create many different grid-based arrangements. |
| grid_square_size | numeric | 100 | The width and height in pixels of each square in the grid. |
| target_color | hex color code | `#999` | The color of the target square. |
| response_ends_trial | boolean | `true` | If true, the trial ends after a mouse click. Feedback is displayed if `show_response_feedback` is true. |
| pre_target_duration | numeric | 0 | The number of milliseconds to display the grid *before* the target changes color. |
| trial_duration | numeric | null | The maximum length of time of the trial, not including feedback. |
| fade_duration | numeric | null | If a positive number, the target will progressively change color at the start of the trial, with the transition lasting this many milliseconds. |
| allow_nontarget_responses | boolean | false | If true, the user can make nontarget response. |
| prompt | string | null | This string can contain HTML markup. Any content here will be displayed below the stimulus. The intention is that it can be used to provide a reminder about the action the participant is supposed to take (e.g., which keys to press). |
## Data Generated
In addition to the [default data collected by all plugins](../overview/plugins.md#data-collected-by-all-plugins), this plugin collects the following data for each trial.
| Name | Type | Value |
| ------ | ------- | ---------------------------------------- |
| grid | array | The grid representation. Each inner array represents a single row. The entries in the inner arrays represent the columns. This will be encoded as a JSON string when data is saved using the `.json()` or `.csv()` functions. |
| target | array | The `[row, column]` target location on the grid. This will be encoded as a JSON string when data is saved using the `.json()` or `.csv()` functions. |
| rt | numeric | The response time in milliseconds for the participant to make a response. The time is measured from when the second stimulus first appears on the screen until the participant's response. |
| response | array | The `[row, column]` response location on the grid. This will be encoded as a JSON string when data is saved using the `.json()` or `.csv()` functions. |
| correct | boolean | Whether the response location matches the target location (`true`) or not (`false`). |
## Install
Using the CDN-hosted JavaScript file:
```js
```
Using the JavaScript file downloaded from a GitHub release dist archive:
```js
```
Using NPM:
```
npm install @jspsych/plugin-serial-reaction-time-mouse
```
```js
import serialReactionTimeMouse from '@jspsych/plugin-serial-reaction-time-mouse';
```
## Examples
???+ example "A classic version of the SRT"
=== "Code"
```javascript
var grid = [
[1,1,1,1]
]
var trial_1 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [0,0]
}
var trial_2 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [0,1]
}
var trial_3 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [0,2]
}
var trial_4 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [0,3]
}
```
=== "Demo"
Open demo in new tab
???+ example "A 2x2 grid with extra space and different colors"
=== "Code"
```javascript
var grid = [
[1,0,1],
[0,0,0],
[1,0,1]
]
var trial_1 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [0,0],
target_color: '#006738'
}
var trial_2 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [0,2],
target_color: '#F78F1E'
}
var trial_3 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [2,2],
target_color: '#13B24B'
}
var trial_4 = {
type: jsPsychSerialReactionTimeMouse,
grid: grid,
target: [2,0],
target_color: '#E74921'
}
```
=== "Demo"
Open demo in new tab