This is the description of the data used in the study "Parietal alpha tACS shows inconsistent effects on visuospatial attention"
Authors: Coldea, A., Morand, S., Veniero, D., Harvey, M. & Thut, G. 
Date: 01/07/2021

File: tACS_behavioural.csv 

Contains the behavioural data from the endogenous attention task used in the experiment. The data is organised as follows:
Column 1 - ID: Participant ID 
Column 2 - STIM_COND: Stimulation condition (10 Hz tACS vs sham)
Column 3 - CUE
	1 = LEFT
	2 = RIGHT
	3 = NEUTRAL
Column 4 - STIM_LOC: STIMULUS LOCATION
	1 = LEFT
	2 = RIGHT
Column 5 - STIM_ROT: STIMULUS ROTATION
	1 = LEFT
	2 = RIGHT
Column 6 - VALIDITY
	1 = VALID
	2 = INVALID
	3 = NEUTRAL
Column 7 - RESPONSE 
	1 = LEFT
	2 = RIGHT
Column 8 - TYPE: FEEDBACK TYPE 
	1 = HIT
	2 = CORRECT NEGATIVE
	3 = MISS
	4 = FALSE ALARM
	5 = TOO FAST
	6 = TOO SLOW
	7 = CUE RESPONSE
Column 9 - CORRECT: CORRECTNESS OF RESPONSE
	1 = CORRECT
	2 = INCORRECT
Column 10 - RT: REACTION TIMES
Column 11 - EYE_MOVEMENT
	0 = INCLUDED TRIALS 
	1 = EXCLUDED TRIALS DUE TO TOO EYE MOVEMENTS


File: tACS_EEG.xlsx 

After the completion of the experimental task and tACS stimulation, resting EEG data was recorded from the occipital sites O1, Oz, O2 (referenced to AFz).
The EEG analysis was conducted in BrainVision Analyzer 2.0 (Brain Products) using a semi-automated approach. The post-tACS continuous EEG signal was segmented into 1 s epochs and a fast Fourier transform (FFT) was calculated for frequencies between 0.1 and 50 Hz using a Hanning window. For each participant, the resulting spectra of each tACS session were averaged across epochs. 
The file contains the IAF peak and corresponding amplitude identified in the frequency window 8-12 Hz for the resting "eyes closed" EEG signal. 


File: tACS_questionnaire.xlsx

Contains the ratings of participants for the questionnaire assessing the intensity of sensations. This was administered in the end of each experimental session. 
The questionnaire data is coded as follows: 
Sensations during the experimental block: 
	1 - none
	2 - mild
	3 - moderate
	4 - considerable
	5 - strong
Beginning of sensations:
	1 - beginning 
	2 - middle
	3 - end 
How long did they last: 
	1 - stopped soon
	2 - stopped middle
	3 - stopped end of block
Did they affect performance:
	1 - no
	2 - a little
	3 - considerably
	4 - quite considerably 
	5 - extremely 
Last session questionnaire: 
	Y - participant distinguished correctly between 10 Hz tACS vs sham session
	N - participants was unable to distinguish between 10 Hz tACS vs sham session