Table 2.
Spearman Correlations Between Symptom Severity, Cognitive Functioning, and Event-Related Potential Measures
| dMMN Amplitude |
pMMN Amplitude |
Duration RP Slope |
Pattern-Violation RP Slope |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HCs | NCVHs | PSZ | HCs | NCVHs | PSZ | HCs | NCVHs | PSZ | HCs | NCVHs | PSZ | |
| BPRS Hallucinations | – | 0.20 | 0.03 | – | 0.13 | 0.16 | – | −0.12 | −0.05 | – | −0.15 | 0.19 |
| BPRS Delusions | – | 0.30 | −0.13 | – | 0.15 | 0.20 | – | −0.06 | −0.10 | – | −0.12 | 0.14 |
| BPRS Positive | −0.07 | 0.18 | 0.00 | −0.04 | 0.09 | 0.11 | 0.22 | −0.16 | −0.12 | −0.07 | −0.14 | 0.18 |
| BPRS Negative | 0.26 | 0.06 | 0.14 | 0.22 | −0.21 | 0.01 | 0.34 | −0.07 | −0.01 | 0.02 | 0.08 | 0.00 |
| BPRS Disorganized | 0.13 | 0.31 | 0.07 | 0.23 | −0.09 | 0.10 | 0.15 | −0.13 | −0.12 | −0.08 | 0.14 | 0.20 |
| LSHS Total | −0.26 | −0.16 | −0.06 | −0.01 | 0.13 | −0.09 | 0.10 | 0.22 | −0.24 | −0.11 | 0.36 | 0.14 |
| WTAR | −0.10 | −0.28 | −0.10 | 0.04 | −0.09 | −0.09 | −0.22 | 0.11 | 0.01 | 0.11 | −0.31 | −0.13 |
| MCCB Processing Speed | 0.00 | 0.12 | 0.13 | −0.08 | −0.01 | 0.21 | 0.05 | 0.33 | 0.04 | 0.24 | −0.16 | 0.05 |
| MCCB Working Memory | −0.10 | 0.06 | 0.13 | −0.10 | −0.08 | 0.00 | −0.03 | 0.25 | −0.00 | −0.01 | −0.29 | −0.12 |
| MCCB Verbal Learning | −0.02 | −0.05 | 0.09 | 0.14 | −0.03 | −0.10 | 0.02 | −0.16 | −0.12 | 0.16 | −0.42 | −0.08 |
Note that BPRS hallucinations and delusions items were “1” for all HCs, and therefore, no correlation is reported.
BPRS, Brief Psychiatric Rating Scale; dMMN, duration MMN; ERP, event-related potential; HCs, healthy comparison subjects; LSHS, Launay-Slade Hallucinations Scale; MCCB, MATRICS Consensus Cognitive Battery; MMN, mismatch negativity; NCVHs, nonclinical voice hearers; pMMN, pattern-violation MMN; PSZ, people with schizophrenia; RP, repetition positivity; WTAR, Wechsler Test of Adult Reading.