biological

• S aim: to investigate the effects on hemisphere disconnection in patients with severe epilepsy
• S sample: 11 split brain patients with severe epilepsy in america, opportunity sample
• S method: quasi-experiment, snapshot study, controlled observation


  IV = split brain or not

  DV = performance on visual and tactile tasks
• S procedure: participants stare at one point on a screen with 1 eye covered as visual stimuli appear on the right or left every 0.1 second. Below the screen is a gap for participants to complete tasks but not see their own hands
• S verbal tests: composite words are displayed and participants need to report word


  image shown to LVF or RVF and patients need to name it
• S recognition test: image shown to RVF or LVF and participants need to display recognition
• S tactile test: participants are shown an object and they need to identify it with their hands
• S dual processing test: participants have one object in each hand simultaneously, then the object is hidden in a pile then each hand must identify its own object
• S results: if one VF responds to an image, only that VF can recognise it


  visual material in RVF (processed by Lh) could be described in speech and writing
• S results: visual material in LVF cannot be seen because the language centre is in the LH


  participants can point out objects they insisted they couldn’t see
• S results:

  composite words split between LVF and RVF are responded to separately 


  If $ is shown to LVF and ? to RVF, left hand can draw $ but the participant says they only saw ?
• C 1: 59 participants, 32 high delayers and 27 low delayers, opportunity sample
• C 2: 27 participants from prior experiment
• C aim: to investigate if delayed gratification in childhood can predict future impulse control
• C method: longitudinal study, two quasi- experiments
• C:

  IV = high or low delayer

  DV 1 = reaction time and accuracy on go/nogo tasks

  DV 2 = activity in target areas of brain
• C: neutral faces are cool stimulus, emotional faces are hot stimulus
• C procedure 1: participant has male/female target and presses button accordingly, a face appeared for 500 milliseconds and a 1 second interval, this happened 160 times (160 trials)
• C procedure 1: 160 trials in 1 run, 120 go 40 nogo, presented in a pseudorandomised order. each participant took place in 2 runs, 1 cool and 1 hot, on the laptop sent to their homes
• C 1 results: no significant difference between high and low delayer reaction time, nogo trials had higher false alarm rates (9.96% cool, 12.2% hot)