experiment psychology

Psychology 465 Experimental Psychology

Fifth Assignment – Lexical Decision

1. Run the Lexical Decision Experiment. Do not change the default settings. Read the instructions (Enter '1' if the second letter string is a word; else press '2' ) carefully before proceeding, since there are no practice trials. You should not be responding to the first word at all; only the second.

2. Save your results, both reaction time and accuracy, by copying and pasting at the end of your assignment. Go to this link and add your data, all across a single row, and then save the file

https://docs.google.com/spreadsheets/d/12gLmjGT1tnBGYX1JzBL1SKcK2xkhgKl9nV4LmPe_WkU/edit#gid=0

3. Read the Background Information document from Canvas Files.

4. Do a complete APA-style report, leaving out only the Abstract section Some hints by section follow:

Introduction

As explained in the background document, there have been similar experiments done, but none using our precise Stimulus Onset Asynchronies (SOAs). Therefore you can propose this experiment as a new one to examine in more depth the time course between SOA and priming. You can also mention applications to other independent variables, such as degree of Asperger’s, bilingualism, etc. Note that you should also find at least a couple of relevant articles to cite in support of your proposed experiment.

Methods

Give all relevant details, (approximate size of letters, fact that everyone used different computers, viewing distance was up to participant, number of words in each condition, etc). Sub-sections should include

Participants (specify number, rough mix of genders, fact that all are students, etc.)

Equipment (pc computers using custom program)

Design ( all repeated measures (since every Participant (P) participated in every condition), 3 (SOAs) by 3 (prime-word conditions), though only two prime-word conditions will be analyzed, making it more like a 3 x 2 design.

Procedure Specify step-by-step what each P does.

Results

(You can analyze the results once there are at least 18 people who have put their data in the spreadsheet. Leave out your own data)

Complete a table like the following for the group means:

Reaction Time
	100 ms	200 ms	500 ms	Means
Related Prime	714.9	678.3	662.25	685.15
Neutral Prime	811.85	786.25	747.5	781.866
Means	763.375	732.275	704.875	733.508

Prepare a graph for RT as a function of SOA, with separate lines for the two prime conditions, as illustrated in the background document from Canvas.

You should analyze the Results with ezANOVA, as explained in the background document from Canvas.

Please include everything into a single document. Cut and paste the output of ezANOVA into the document, in an Appendix.

Discussion

This should be in your own words, and not necessarily in the following order or format, but:

1. We are predicting a significant main effect for Relatedness. Related primes should be quicker.

2. It is not clear what should be predicted for the main effect of SOA, though based on an earlier, class’ results, we might expect that longer SOAs will give quicker RTs.

3. It is also not clear what should be predicted for the interaction of SOA and Relatedness. The information document gives one hypothetical possibility, but that is only for illustrative purposes. Regardless of what we predict, an interaction between SOA and Relatedness might give some insight into the ideal time period for spreading activation, as discussed in the information document.

References

All cited articles should be included in standard APA format.

ANOVA: Design 2 Within Subject Factors

relatedness F(1,19) = 7.66 p<0.012234 SS=32724.05 MSe=4269.58

Neutral F(1,19) = 14.9 p<0.001042 SS=63845.00 MSe=4273.37

relatedness*Neutral F(1,19) = 25.6 p<0.000069 SS=173352.20 MSe=6765.62

81121.950000003: 81194: 128546.799999997: 1789619.55

Eta relatedness = 0.015485

Eta Neutral = 0.029774

Eta relatedness*Neutral = 0.076914