Saykin, AJ, Shtasel, DL, Gur, RE, Kester, DB, Mozley, LH, Stafiniak, P., et al Neuropsychological deficits in neuroleptic naive patients with first-episode schizophrenia. Arch Gen Psychiatry
1994; 51: 124–31.
Leeson, VC, Sharma, P., Harrison, M., Ron, MA, Barnes, TR, Joyce, EM. IQ Trajectory, cognitive reserve, and clinical outcome following a first episode of psychosis: a 3-year longitudinal study. Schizophr Bull
2011; 37: 768–77.
Green, MF, Kern, RS, Heaton, RK. Longitudinal studies of cognition and functional outcome in schizophrenia: implications for MATRICS. Schizophr Res
2004; 72: 41–51.
Wykes, T., Huddy, V., Cellard, C., McGurk, SR, Czobor, P.
A meta-analysis of cognitive remediation for schizophrenia: methodology and effect sizes. Am J Psychiatry
Khandaker, GM, Barnett, JH, White, IR, Jones, PB. A quantitative meta-analysis of populationbased studies of premorbid intelligence and schizophrenia. Schizophr Res
2012; 132: 220–7.
Deary, IJ. Intelligence. Annu Rev Psychol
2012; 63: 453–82.
The Wechsler Adult Intelligence Scale Manual (3rd edn). The Psychological Corporation, 1997.
Dickinson, D., Goldberg, TE, Gold, JM, Elvevag, B., Weinberger, DR. Cognitive factor structure and invariance in people with schizophrenia, their unaffected siblings, and controls. Schizophr Bull
2011; 37: 1157–67.
Dickinson, D., Ramsey, ME, Gold, JM. Overlooking the obvious: a meta-analytic comparison of digit symbol coding tasks and other cognitive measures in schizophrenia. Arch Gen Psychiatry
2007; 64: 532–42.
Leeson, VC, Barnes, TR, Harrison, M., Matheson, E., Harrison, I., Mutsatsa, SH, et al The relationship between IQ, memory, executive function, and processing speed in recent-onset psychosis: 1-year stability and clinical outcome. Schizophr Bull
2010; 36: 400–9.
Penke, L., Maniega, SM, Bastin, ME, Valdes Hernandez, MC, Murray, C., Royle, NA, et al Brain white matter tract integrity as a neural foundation for general intelligence. Mol Psychiatry
2012; 17: 1026–30.
Gray, JR, Chabris, CF, Braver, TS. Neural mechanisms of general fluid intelligence. Nat Neurosci
2003; 6: 316–22.
Woolgar, A., Parr, A., Cusack, R., Thompson, R., Nimmo-Smith, I., Torralva, T., et al Fluid intelligence loss linked to restricted regions of damage within frontal and parietal cortex. Proc Natl Acad Sci USA
2010; 107: 14899–902.
Jung, RE, Haier, RJ. The Parieto-Frontal Integration Theory (P-FIT) of intelligence: converging neuroimaging evidence. Behav Brain Sci
2007; 30: 135–54.
Minzenberg, MJ, Laird, AR, Thelen, S., Carter, CS, Glahn, DC. Meta-analysis of 41 functional neuroimaging studies of executive function in schizophrenia. Arch Gen Psychiatry
2009; 66: 811–22.
The multiple-demand (MD) system of the primate brain: mental programs for intelligent behaviour. Trends Cogn Sci
2010; 14: 172–9.