The purpose of the present study was to clarify the behavior of students with profound retardation when they are in a learning situation. For this purpose, teacher-student interaction categories were created by dividing behavior into 4 sub-categories: verbal, non-verbal, learning movement, and non-learning movement. The frequency of each category of behavior was calculated through a time-sampling method. In addition, changes in the students' heart rate while they were being taught were measured as an index of their cognitive activities. Participants were 3 students with profound retardation, whose developmental ages were measured as 5 months, 1 year 7 months, and 4 months, respectively. The main results were as follows: (1) The frequency of behavior in the learning movement category during the development portion of the lesson was higher than during the introduction to and conclusion of the lesson. (2) After class, when the chief teacher called the students' names, all 3 exhibited a gradual decrease in heart rate, and then their heart rate changed to a pattern of an alternating gradual increase and decrease. (3) When the students used a percussion instrument with the support of the teacher's aides, they showed a simultaneous gradual decrease in heart rate. These results show that students with profound retardation attend positively when they are being taught, and temporarily synchronize their cognitive activities.
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