This is an implementation of Posner's so-called "spotlight of attention" cueing task. In this task. a left or right cue is provided, indicating where the response is likely to be. then, a stimulus is shown (either to the left or right of fixation) and the participant must respond left or right. In addition, neutral probes are given to help measure alerting. By default, there are 15 valid stimuli, 5 invalid, and 5 neutral stimuli per repetition. Changing these values will allow for cue validity to be manipulated.
See also the ANT task for an updated version that incorporates flanker interference and orienting cues.
The following parameters are available to set via the launcher
- numValid|15|Number of Valid stimuli per side
- numInvalid|5|Number of Invalid stimuli per side
- numNeutral|5|Number of neutral stimuli per side
- fontsize|22|Font size of stimuli
- reps|4|Number of repetitions of the design.
 Data Output
Data are saved into the .csv file data\subnum\spatialcueing-subnum.csv. Example:
subnum,trial,cue,stim,correct,delay,rt 3,1,0,-1,0,354,536 3,2,-1,1,0,264,588 3,3,0,-1,0,285,395
- cue indicates whether the cue was positive, negative, or neutral.
- stim indicates whether the response was left (-1), right (+1).
- correct indicates whether the response was correct.
- delay is the (random) delay between cue and stimulus, in ms
- rt is the response time in ms
Posner, M. I. (1980). Orienting of attention. Quarterly Journal of Experimental Psychology, 32, 3-25.