Expectations and Motives for Substance Use in Schizophrenia

Abstract

This study examined the internal reliability of standardized measures of substance use expectancies and motives in a schizophrenia population (n = 70) and the relationship of these expectancies and motives to alcohol and drug use disorders. Internal reliabilities were uniformly high for the subscales of the expectancy and motive measures. Analyses of the relationship between substance use disorders and expectancies revealed strong substance-specific expectations. Alcohol expectancies were related to alcohol disorders but not to drug disorders; cocaine expectancies were related to drug but not to alcohol disorders; and marijuana expectancies were more strongly related to drug than to alcohol use disorders. In contrast, motives were related to substance use disorders, and self-reported substance use problems were related to expectancies and motives in a non-specific manner. These results suggest that expectancy and motive questionnaires developed for the primary substance abuse population may be valid for psychiatric populations. Research on motives and expectancies may help to clarify the functions of substance abuse in persons with schizophrenia.

Reasons for Cannabis Use and Effects of Cannabis Use as Reported by Patients with Psychotic Disorders

“…Like Spencer et al [31] , Mueser et al [27] also used the DMM [43] , but an earlier version. Mueser et al [27] adapted the DMM for assessing motives for drug use and developed the Drug Use Motives Measure.…”

“…Like Spencer et al [31] , Mueser et al [27] also used the DMM [43] , but an earlier version. Mueser et al [27] adapted the DMM for assessing motives for drug use and developed the Drug Use Motives Measure. Mueser et al [27] scores were reported separately for different groups of drug-abusing patients, ranging from groups with no abuse to recent drug abuse.…”

“…Mueser et al [27] adapted the DMM for assessing motives for drug use and developed the Drug Use Motives Measure. Mueser et al [27] scores were reported separately for different groups of drug-abusing patients, ranging from groups with no abuse to recent drug abuse. The results are comparable with the study by Spencer et al [31] .…”

“…Four studies assessed the effects of cannabis use with a Likert scale [26,27,33,35] . Baigent et al asked 35 patients about the perceived effect of cannabis on 10 dimensions of feelings and symptoms [26] .…”

Amphetamine Versus Non Amphetamine-Related First Episode Psychosis in Saudi Arabian Patients

“…In patients with psychosis like schizophrenia and/or bipolar disorder, substance abuse has been reported [1][2][3][4]. Previous studies have found high prevalence of schizophrenia and other psychotic disorders among users of illicit substances like cannabis [5] and amphetamines [6,7].…”