analysis of environmental variables affecting the observed biobehavioral states of individuals with profound handicaps

Historically, there have been questions concerning the areas and methods of assessment that are appropriate with individuals with profound handicaps. Recently, research efforts toward the assessment of biobehavioral states of these individuals have been advocated. The purpose of this study was to examine how biobehavioral states and orienting responses might be influenced by environmental variables. More specifically, this study involved investigation into whether increasing degrees of stimulation provided through individuals, activities, and objects in the environment appeared to influence the biobehavioral states of the subjects. Additionally, the influence of time of day, day of week, the position of the subject, and the subject's prior state were explored. Five subjects were selected from a classroom for students with profound mental handicaps in southeast Florida. Subjects were observed using a partial-interval recording procedure and a previously developed and piloted instrument. Each subject was observed for 20 observation periods with each period consisting of 15, 20 second intervals. These observation periods were evenly distributed across mornings and afternoons and across the days of the week. Subjects were randomly selected for the order of observations. One additional rater was used in addition to the investigator for reliability purposes. The overall reliability coefficients for all observed variables exceeded.90. All environmental variables and the prior state variable were crosstabulated with the state variable and the significance of each bivariate relationship was tested using the chi-square statistic. All environmental variables, with the exception of the continuous auditory stimulation variable, shared a statistically significant relationship with the state variable (p < .0277). Prior state also shared a statistically significant relationship. Additionally, those environmental variables with the strongest relationships with the state variable along with the prior state variable were used as predictors for a multiple regression procedure. State was used as the criterion variable and significant variance was predicted by the environmental and prior state variables. This study resulted in an increase in the data base concerning state assessment in students with profound handicaps, investigated environmental variables that may have affected state occurrences, and raised issues concerning previous and future research. In addition, implications concerning how instructional grouping, provision of stimulating activities, intensity of staff-student interactions, positioning of students, and time of day and day of week might have affected subjects' biobehavioral states were discussed.