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Table 1 Neuropsychological assessment of patients with Parkinson’s Disease-mild cognitive impairment (n = 20)

From: Transcranial direct current stimulation enhances theory of mind in Parkinson’s disease patients with mild cognitive impairment: a randomized, double-blind, sham-controlled study

  Mean (SD) Cut-off
Screening for dementia
 Mini Mental Parkinson 28.0 (2.7) ≥22.85
Global cognitive abilities
 Parkinson’s Disease-Cognitive Rating Scale (PD-CRS)
  PD-CRS Total Score (max: 134) 78.9 (15.6) ≥82
  PD-CRS Cortical Score (max: 30) 26.1 (2.4)
  PD-CRS Frontal Subcortical Score (max: 104) 52.8 (14.0)
Memory
 Rey Auditory Verbal Learning Test, immediate recall 35.8 (11.1) > 28.52
 Rey Auditory Verbal Learning Test, delayed recall 7.0 (3.5) > 4.68
 Digit Span (Forward) 5.5 (0.9) > 4.25
 Digit Span (Backward) 4.1 (0.9) > 2.64
Language
 Verbal Fluency, phonemic 30.6 (9.9) > 16
 Verbal Fluency, semantic 37.2 (9.0) > 24
 Objects Picture Naming task (International Picture Naming Project (IPNP), %) 69.1 (11.9)
 Actions Picture Naming task (IPNP, %) 87.3 (14.2)
Attentional and Executive Functions
 Frontal Assessment Battery 15.3 (2.5) > 13.4
 Stroop test (interference effect on time, seconds) 32.4 (14.1) < 36.92
 Stroop test (interference effect on error number) 2.4 (3.3) < 4.24
 Trail Making Test, part A (seconds) 51.8 (26.5) < 94
 Trail Making Test, part B (seconds) 184.7 (125.7) < 283
 Test of Attentional Performance
  Go/NoGo (time, ms) 528.9 (88.7)
  Go/NoGo (accuracy) 28.2 (2.5)
  Working Memory (time, milliseconds) 803.6 (192.5)
  Working Memory (accuracy) 11.7 (1.1)
  Response Flexibility (time, milliseconds) 1390.4 (512.2)
  Response Flexibility (accuracy) 78.0 (17.8)
  1. Raw scores are reported. Standard deviation (SD) is presented in parentheses
  2. Cut-off scores according to Italian normative data are reported
  3. Bold data indicate scores below the cut-off value