In the babylab (room K.11) we run experiments to study language acquisition and language development of young infants. Current setup with three movable video screens, three animated lights and three speakers in a three-sided booth allows to run the head-turn preference procedure, the preferential looking procedure, the switch procedure and other experiments of similar nature.
For experiments involving interaction by the caregiver or experimenter with the infant the flex lab is better suited.
- The test room houses a three-walled booth in which the infant and its caregiver are to be seated.
- Sound dampened by open cell foam cushions placed on the walls.
- The three-walled booth (with ceiling) consists of an aluminium box-shaped framework onto which unbleached cotton tent cloth is strapped on the inside, similar to construction used at Baby Lab Maastricht; internal dimensions: width 185 cm, depth 185 cm, height 197 cm; see drawing below
- Lighting: dimmed, in booth (i.e. under the tent cloth) approx. 65 lux
- Chair: regular comfortable four legged chair; positioned as depicted in drawing below
- Left speaker position and normal position of left LED box for head turning experiments; instead of the LED box the left display monitor can be hung here
- Right speaker position and normal position of right LED box for head turning experiments; instead of the LED box the right display monitor can be hung here
- Normal position of left display monitor for preferential looking experiments; instead of the display monitor the left LED box can be hung here
- Normal position of right display monitor for preferential looking experiments; instead of the display monitor the right LED box can be hung here
- Camera position, frontal speaker position and normal position of frontal LED box for head turning experiments; instead of the LED box the central display monitor can be hung here for switch procedure experiments
All equipment (camera, speakers, LED boxes, monitors) are behind the canvas spanning the framework. The camera peeks though a hole in the canvas. The desired LED boxes and/or monitors can be made visible to the infant by removing the canvas insets normally covering the LED boxes and monitors. The height from floor to center of LED boxes and display monitors is 95 cm.
The notions left and right are always from the camera’s point of view. So presenting a stimulus on the left hand side means the child will notice it coming from its right hand side. Be aware of this when setting up an experiment for children with single sided hearing loss.
- Headphones Echelon Telex (aviation headset); to be worn by caregiver to prevent the caregiver from hearing stimuli presented to the baby and to give instructions to the caregiver if necessary
- Color video camera JVC TK-C1481EG
- 3x 15″ monitor Philips LCD 150P4
- 3x custom made LED box, with three separately driven LED sections placed in concentric circles (resp. 1, 8 and 16 LEDs)
- 3x speaker Tannoy X in 20x20x12 cm in custom made boxes.
See above drawing for the positions of camera, monitors, LED boxes and speakers.
- PC Paradigit Asus P4PE:
- CPU Intel Celeron 1.8GHz
- memory 1Gb
- audio card RME digi96/8 PAD
- video card Matrox G200 MMS (quad head)
- Button box (two buttons)
- Headphones Beyerdynamic DT250/80
- Microphone Sennheiser ME-64
- Microphone preamplifier/mixer Advantadge SPM413e
- Headphones amplifier Symmetrix 506E
- Mono amplifier Marantz MA6100 (drives frontal speaker)
- Stereo amplifier Rotel RB-850 (drives left and right speakers)
- TV monitor Sony Trinitron KV-21T1D
- DVD/harddisk recorder Sony RDR-HX725
- CD player Denon DCD-655
- Room number: K.11
- Phone extension: 8427
- Reserve this facility
Keeping the facilities in this lab in the best possible condition requires your cooperation; please read the house rules and stick to them. Especially important:
- Never ever change or remove any wiring; don’t pull out any plugs
- No eating or drinking (except coffee, tea, water)
- Clean up
- Ask for help, report all problems