• Article
• Download ChildCIdb_v1
• Description of ChildCIdb_v1
• Acquisition Process
  • Emotional State Self-Assessment
  • Block 1: Touch Analysis
    • Test 1: Tap and Reaction Time
    • Test 2: Drag and Drop
    • Tests 3 and 4: Zoom-in and Zoom-out
  • Block 2: Stylus Analysis
    • Test 5: Spiral Test
    • Test 6: Drawing Test
• References

R. Tolosana, J.C. Ruiz-Garcia, R. Vera-Rodriguez, J. Herreros-Rodriguez, S. Romero-Tapiador, A. Morales and J. Fierrez, "Child-Computer Interaction: Recent Works, New Dataset, and Age Detection", IEEE Transactions on Emerging Topics in Computing, doi: 10.1109/TETC.2022.3150836, 2022.

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ChildCIdb_v1 is the largest publicly available dataset to date for research in the e-Learning and e-Health areas. The research carried out with this database aims to generate a better understanding of children's cognitive and neuromotor development while interacting with mobile devices.

This is the first version of an on-going dataset collected in collaboration with the school GSD Las Suertes in Madrid, Spain. It comprises one capturing session with 438 children in total in the ages from 18 months to 8 years, grouped in 8 different educational levels according to the Spanish education system.

Regarding gender, 50% of the children were male/female whereas, for the handedness, 84% were right-handed. In addition, other information considered has been: i) the previous experience of the children with mobile devices, ii) the children’s grades at the school, and iii) information regarding the attention-deficit/hyperactivity disorder (ADHD).

We first capture the emotional state of the children before the beginning of the acquisition:

• Emotional State Self-Assessment (10 seconds)

  Three faces with different colours and facial expressions were represented on the screen, asking the children to touch one according to their emotional state using the finger as input.

  • Filename: info.json
  • File structure: a Python dictionary (JSON) whose keys are {"timestamp, "emotion", "laterality"}.
    
    

The acquisition process comprises 6 different tests grouped in 2 main blocks: 1) Touch Analysis, and 2) Stylus Analysis.

The first block comprises 4 different tests with different levels of difficulty to see the ability of the children to perform different hand gestures and movements:

• Test 1: Tap and Reaction Time (30 seconds)

  The goal is to touch one mole at a time in order to see the ability of the children to perform tap gestures and their reaction times. Once the mole is touched, it disappears from that position and appears in another position of the screen.

  

  • Filename: tap.txt

  • File structure: A plain text file with tab-separated values where each column value is [x, y, timestamp, x_min, x_max, y_min, y_max, pressure, inTarget, action] in that order.
    

    Value	Description	Value	Description
    x	X-coordinate.	y_min	Minimum Y-coordinate value for the mole.
    y	Y-coordinate.	y_max	Maximum Y-coordinate value for the mole.
    timestamp	Time instant at which the sample was taken for that row.	pressure	Pressure exerted by the child [0,1].
    x_min	Minimum X-coordinate value for the mole.	inTarget	Indicates whether the child is touching the mole or not.
    x_max	Maximum X-coordinate value for the mole.	action	Indicates the type of action the child is performing (0: starts pen-down, 1: starts pen-up, 2: pen-down).

    In order to facilitate the comprehension of some values, the subset of x_min, x_max, y_min, y_max help us to identify the mole within the test coordinate system. Using these 4 values, a bounding box is formed which indicates the position, height and width of the mole on the plane.

    

• Test 2: Drag and Drop (30 seconds)

  The goal is to touch the carrot and swipe it to the rabbit.

  

  • Filename: drag.txt

  • File structure: A plain text file with tab-separated values where each column value is [x, y, timestamp, x_min, x_max, y_min, y_max, pressure, inTarget, action] in that order.
    

    Value	Description	Value	Description
    x	X-coordinate.	y_min	Minimum Y-coordinate value for the rabbit.
    y	Y-coordinate.	y_max	Maximum Y-coordinate value for the rabbit.
    timestamp	Time instant at which the sample was taken for that row.	pressure	Pressure exerted by the child [0,1].
    x_min	Minimum X-coordinate value for the rabbit.	inTarget	Indicates whether the child is touching the carrot or not.
    x_max	Maximum X-coordinate value for the rabbit.	action	Indicates the type of action the child is performing (0: starts pen-down, 1: starts pen-up, 2: pen-down).

    In order to facilitate the comprehension of some values, the subset of x_min, x_max, y_min, y_max help us to identify the rabbit within the test coordinate system. Using these 4 values, a bounding box is formed which indicates the position, height and width of the rabbit on the plane. This concept can be applied equally to tests 3 and 4.

    

• Tests 3 and 4: Zoom-in and Zoom-out (30 seconds each)

  The goal is to enlarge/decrease the rabbit and put it inside the two red circles for a short time.

  

  • Filename: more_zoom.txt and less_zoom.txt
  • File structure: A plain text file with tab-separated values where each column value is [x, y, timestamp, xCircle, yCircle, r1, r2, x_min, x_max, y_min, y_max, scale, pressure, inTarget, action] in that order.
    
    

  Value	Description	Value	Description
  x	X-coordinate.	x_max	Maximum X-coordinate value for the rabbit.
  y	Y-coordinate.	y_min	Minimum Y-coordinate value for the rabbit.
  timestamp	Time instant at which the sample was taken for that row.	y_max	Maximum Y-coordinate value for the rabbit.
  xCircle	X-coordinate of the centre of the circles.	scale	Scaling factor for the size of the rabbit.
  yCircle	Y-coordinate of the centre of the circles	pressure	Pressure exerted by the child [0,1].
  r1	Radius of the inner circle.	inTarget	Indicates when the rabbit is between the two red circles.
  r2	Radius of the outer circle	action	Indicates the type of action the child is performing (0: starts pen-down, 1: starts pen-up, 2: pen-down first finger, 3: pen-down second finger).
  x_min	Minimum X-coordinate value for the rabbit.

The second block aimed to analyse the ability of the children to use the pen stylus by means of 2 different tests:

• Test 5: Spiral Test (30 seconds)

  The goal is to go across the spiral from the inner part to the outer part, trying to keep it always in the area remarked in black colour.

  

  • Filename: test1.txt
  • File structure: A plain text file with tab-separated values where each column value is [x, y, timestamp, pressure, inTarget, action] in that order.
    
    

  Value	Description	Value	Description
  x	X-coordinate.	pressure	Pressure exerted by the child [0,1].
  y	Y-coordinate.	inTarget	Indicates whether the child draws inside the spiral or not.
  timestamp	Time instant at which the sample was taken for that row.	action	Indicates the type of action the child is performing (0: starts pen-down, 1: starts pen-up, 2: pen-down).

• Test 6: Drawing Test (2 minutes)

  The goal is to colour the top and trunk of the tree in the best way possible trying to fill it completely and draw always inside the area remarked in black colour.

  

  • Filename: test2.txt
  • File structure: A plain text file with tab-separated values where each column value is [x, y, timestamp, pressure, inTarget, action] in that order.
    
    

  Value	Description	Value	Description
  x	X-coordinate.	pressure	Pressure exerted by the child [0,1].
  y	Y-coordinate.	inTarget	Indicates whether the child draws inside the tree or not.
  timestamp	Time instant at which the sample was taken for that row.	action	Indicates the type of action the child is performing (0: starts pen-down, 1: starts pen-up, 2: pen-down).

For further information on the database and on different applications where it has been used, we refer the reader to:

• R. Tolosana, J.C. Ruiz-Garcia, R. Vera-Rodriguez, J. Herreros-Rodriguez, S. Romero-Tapiador, A. Morales and J. Fierrez, "Child-Computer Interaction: Recent Works, New Dataset, and Age Detection", IEEE Transactions on Emerging Topics in Computing, doi: 10.1109/TETC.2022.3150836, 2022.

All these articles are publicly available in the publications section of the BiDA group webpage. Please remember to reference the above articles on any work made public, whatever the form, based directly or indirectly on any part of the ChildCIdb_v1 database.