Market-research firm Performance Plus of Framingham is recruiting children — specifically, boys and girls between the ages of 7 and 12 who play with STEM toys at home — for a survey.  The survey will take place in the child’s home, where she or he will have the opportunity to interact and experiment with a prototype concept.  Families that participate will receive a Bose Soundlink Mini Bluetooth speaker.  If interested, call Evelyn Field at 508-868-5886.